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. Past bra strap length heading for waist.

CO-wash: Inecto coconut/ Elvive Volume Collagen
Treatments: Komaza Care Matani, coconut/ sweet almond/ fractionated coconut oils, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss Ultimate Volume, various Elvive
Styler: Umberto Giannini jelly, Au Naturale styling gelee
Flour sack towel, pixie diffuse or air dry.
Experimenting with: benign neglect