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.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.