Storm, with all things going on my memory is not it’s usual self, but Pupsie is sorting you with the P50W decant iirc. I think it’s a good one to try. Very helpful with the copy/pasting, I have started to keep some files to keep you all separated so you saved me some time 
. No plans for a blog (generally not a fan of the pushing products format) but if I find some time I might start archiving some of the things on these threads on a stand alone website that’s easier to search through than the mass amount of text in one or two threads including all my deviating chat.
Wrt the rest of your routine, I think it’s good to step away from the natural stuff for a bit. Also I think you’re going to need to detach the idea that a ‘good’ product comes at a certain price. I think it’s very tempting to follow bloggers and when they claim, ‘this is my favourite cleanser and it’s so worth the extra bit of money’ that it must be a great product for you too where the psychological aspect of the price point actually helps compound that argument. Thing is, it often isn’t, I wouldn’t rec my favourite cleanser to everyone, yes it’s perfect for me but it most certainly won’t be for many. Meanwhile boring and functional LRP Toleriane Dermo will help most because it’s boring and functional.
So things to avoid in your case are the more natural products, you’ve mentioned avoiding Shea (but you have a few products containing them) I assume as it’s clogging so we need to stay away from what I call the solid fats too when it comes to leave on products (like shea, cocoa seed, coconut, etc.).
I definitely think you’d benefit from BHA (The PC 2% liquid, clear or normal version) but since you’re trying out the P50 see that through first. They work well together but I wouldn’t want you trying them both at once.
Routine:
AM.
Sunday Riley Ceramic Slip or TH nourishing oil cleanser (neither are suitable j think) LRP Toleriane Dermo Cleanser
Serozinc
Just started Zelens vitamin D treatment drops ← finish up as it’s a rather pricey product and reevaluate once finished
Skin Owl eye gel ← see Zelens
LRP cicaplast LRP Toleriane Fluid - again boring as can be but for now a steady partner that isn’t likely to cause reaction.
SPF - you can try the Biore Watery Essence, you might also be fine with the LRP Anthelios Fluid (but proceed with caution, reactions to this vary wildly), The Body Shop sunscreen as mentioned upthread is also decent if you can handle fragrance (goes for all of these three).
PM
Body shop chamomile cleansing butter ← you’re alternating this with Clinique TTDO right, wrt to avoiding the natural stuff I’d keep away from the BS CB but if it’s doing no harm keep at it.
Sunday Riley or TH cleanser LRP TDC
Have recently stopped using pixi glow/nil+fab pads due to earlier chat You’ll be trying the P50W here so let’s see how you get on with that a few times a week.
Vitamin E mist from body shop ← ^if this works for you keep at it but I don’t necessarily see a need for it.
Skin owl eye gel
Zelens vitamin D
LRP cicaplast Stick with the LRP Toleriane Fluid for now but if you want something more it’s probably worth looking at the night time Face Theory moisturisers for now.
Occasional treatments:
Oskia exfoliator - if it’s truly occasional and used when in need and it works for you fine.
Body Shop warming clay mask ← does this do anything for you, by the ingredients it just appears to be a bit of clay with a lot of fragrance that heats up 
TH ← ?
May Lindstrom problem solver ← A clay mask with Vit C and charcoal, so far so good if you ignore the price but it also contains a lot of potentially irritating spices, essential oils, etc. how do you react to this?
May Lindstrom blue cocoon ← This contains a lot of shea butter (and other solid fats) and would be more suited to drier skin, I know it’s prohibitively expensive but is it working for you? Are you using this to combat dry patches, which would be more indicative of dehydration than dry skin?
So in short, I want to get you to a point of a most non-irritating baseline routine as possible and then introduce some other actives that would be beneficial to you, like Vit C, Niacinamide, possibly Retinol, etc.
Also if you are experiencing some dryness and it is down to dehydration it would be helpful to incorporate a HA serum in the AM.