Treating plaque psoriasis on the scalp with natural afro hair

Hi All. I've been diagnosed with plaque psoriasis for a year now. Hand on heart I probably had it for a year and a half before that, but I thought it was ezcema or ringworm and was using over the counter remedies. One of my main problem areas is my scalp. I have natural curly afro hair and when I get a flare up it really covers my whole head. I've been prescribed dermarol 500 to debride my scalp, then polytar shampoo, then Enstilar foam. The thing is, due to my hair texture it's really difficult to get the treatments directly to my scalp. Also excretions from where my skin has cracked or is irritated, plus the treatments themselves matts my hair. This makes it difficult to see where to apply things and also to deliver the products to my skin. It's so painful and tight....plus when i wash my hair and comb it or try to detangle it when wet (a must) it cracks and lifts the scales....I bleed onto my pillow and my scalp is constantly itchy and flaky...and it's incredibly difficult to even tie my hair up for work.... Please can anybody help? I'm waiting to see a community dermatologist and hopefully try some UV treatment. Any advice re washing techniques, products, anything etc. would be much appreciated. It's so painful and really affecting me. Thanks in advance. Xxx