Why do you say oil is not helpful? Are you using enough conditioner? I can't follow acronyms, sorry, and those are not in the sticky. What are your dew points and properties? Glycerin is not the only potent humectant, have you looked at the balance of the others (propylene glycol, honey, aloe vera etc)?
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