Perhaps your hair is low porosity. I have fine low porosity hair and get build up easily including protein build up. My hair is def not invisible when held to light. I always thought it was more medium to coarse!! Anyway, stuff just sits on my hair and maybe that's happening to you.
I also recommend tresemme naturals. I've used both with no problem. I think the radiant volume(?) one may have a bit more slip.
3a/b, fine texture, low porosity, normal elasticity, mod-CG 7/11/11
Poo: KC Come Clean, SM Moisture Retention
CO: CJ Curl Rehab, CJ Argan & Olive Oil, Renpure Argan Oil, YTCucumbers, Sevi Pumpkin
Style: AIF, HESMU, Biolage gelee, KCCC
LOOB for second day hair
Like BS/ACV rinses, limit protein/humectants.