Hi, Amysangel!
While the concept of toners have been embedded in many's minds as part of a fully constructed skin care regimen, it's actually not a "required" item that all folks need. Traditionally, toners have astringent properties that aid in oil regulation and balancing the pH of skin; however, many of these original formulas relied on harsh, drying oils to break down oils to rid them quickly and in turn they dehydrated skin. If you're a stickler for having some sort of liquid formula that's applied to skin prior to a treatment, you may want to check into a gentle facial mist or conditioning spray.
With the mention of skin being relatively normal with an oily/combo t-zone and dehydration being quick to set in, I would inquire how your skin looks and feels right when you wake up. While oil production doesn't cease when you sleep, if your skin isn't super slicked with oil when you wake, you may not even need a full cleanse. Though the Caudalie Cleansing Milk is very gentle and it's properties cater well to your rosacea to calm it and soothe, overcleansing (even with the most delicate of formulas) can be counterproductive and may be contributing to the dehydration. When one overcleanses skin when it's not called for, it can head to dehydration or even skin quickly producing an excess of oil to compensate for what is lost.
Since you've mentioned some very top notch brands already such as Caudalie and Tatcha, check into the facial mists/sprays they offer if you want a refreshing "pick me up" for the morning. You can mist on their formulas to skin or even saturate a cotton pad and wipe down skin while energizing your senses for the start of your day without doing a fuller cleanse.
For a treatment or serum, try something that focuses on easing redness and gently conditioning skin. Ingredients such as oat, calendula, aloe, cucumber, mallow, feverfew, jojoba, and even milk extracts (including the gentle alpha hydroxy acid lactic acid, which is derived from milk proteins) are all properties that focus on calming skin and can also aid as anti-inflammatories. Ren's Evercalm Anti-Redness Serum, First Aid Beauty's Anti-Redness Serum, and Murad's Sensitive Skin Soothing Serum are all options to check out.
Due to your skin being sensitive and reactive, try to obtain samples of new items and do test patch applications on smaller regions to see how they work with your skin. Also, any changes that you're making, try new things out one at a time. By trying to change up or add in too much all at once and you can risk throwing your skin in for a shock and it may react to one particular item, but it'll be hard to narrow down what caused the hiccup.
For day time, definitely incorporate SPF into your moisturizer. While all skin needs SPF (regardless of age or concerns), skin that may be sensitized or sensitive will definitely need all the protection it can get from the elements, UV rays, and free radicals. Without a moisturizer, treated skin is left "raw" or "open" and when met with external factors, it can be more prone to damage. Think of the process a car body getting restored, the treatments and serums you use would be the sanding and painting process, but it can't just be painted and then left as it, there needs to be a top coat and even wax buffed in to "seal" over that paint job and to protect it so it lasts and doesn't just get easily chipped or damaged. The same goes with skin care, only the moisturizer/SPF is the top coat and protective "wax" step.
For some no-fuss SPF moisturizers that work to primarily moisturize, protect, and condition skin, try Skin Laundry's Daily Moisturizer SPF 35 (has a comfortable matte finish and also incorporates cucumber and healing arnica extract) or Boscia's SPF moisturizers (the Self-Defense Vital Anti-Oxidant SPF 30 provides free radical protection to strengthen skin from pollutants and the Oil-Free Daily Hydration SPF 15 is a balancing formula that controls oil without drying out skin and has jojoba extract).
Which Clarisonic brush head do you use? The luxe, sensitive, or delicate brush heads would be the optimal styles suited for your skin type and concerns. Be sure that you're not pressing down super hard while you're using your Clarisonic to avoid overworking skin.
Since the Sunday Riley Luna Oil is quite potent, having this as your night treatment and even treatment/moisturizer hybrid may be the most "active" product your skin will tolerate. Oils typically are applied after a moisturizer because their composition is more deeply hydrating than a traditional lotion, gel, or cream formula; however, because the SR oil is fortified, if you're using it as more of your treatment, be sure it at least has absorbed down in full before applying your Korres moisturizer so that way the oil isn't forming a film or barrier on skin to prevent the moisturizer from sinking in. If you find the oil may be making skin a bit tender because of how potent it is, try applying it after the moisturizer so it's treatment qualities are essentially the "last" thing that touches down into skin and thus is absorbed more slowly.
In terms of targeting pores, is it decongestion or purifying impurities from them or are you just looking to refine their appearance? Since pore size is determined by genetics, there's no way to shrink or alter their size permanently with over the counter products; however, keeping them clean and clear is a way to have them appear diminished. Since skin is sensitive, I would suggest focusing first on making the above changes or incorporations gradually before looking to tackle this aspect. The retinoic ester that is used in the SR oil will help will improving skin's texture and promote repair, so that will help with keeping skin smooth (thus areas with pronounced pores don't feel so rough) and even aid in improving cellular tissue within pore walls (thus making pore quality better and not look so textured).