Maybe the fatty acids and fatty alcohols are building up in combination with the oils you are also using. Have you tried clarifying or just a week or two on a light CO-wash/ milk type conditioner? Will your hair type not permit detangling in the shower with soaking wet hair coated in conditioner?
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics