My Scalp is Changing, So Must My Hair Serum

This Summer has been the worst on my scalp and hair, I think I have created about 10 oil blends for my scalp. It started when I noticed that after about a week of doing my weekly hair regime, I noticed that my scalp was becoming drier and flakier faster than normal. I co-wash or wash my hair every Friday, I will also put in some twists or just some basic plats, I also do a hot oil treatment weekly also, but it appeared as if my scalp was just sucking up my hair serum, so I began remixing and adding in different types of oils removing some oils from the formula, trial and errors, and noticed that they would keep my scalp flake and itch free for about 1 day and the next day I would notice I have these HUGE flakes in my head. Now as a reminder I do suffer from Plaque Psoriasis on my scalp, but it was beginning to get worse, so  I began adding Hempseed Oil with extra Apricot Oil and Jamaican Black Castor Oil, with a few drop of Peppermint and so far it seems to be working, it has been 2 weeks since I started this regime and I must say my scalp is clearer and itch free. I plan on introducing this new formula soon.