Try coconut oil as an overnight treatment instead of a leave in. Other ingredients beneficial for porous or damaged hair that will not weigh you down include hydrolysed protein, ceramides and panthenol.
There is nothing wrong with fine hairs using a super gentle (pH 4.5 to 5.5) sulphate free and anionic surfactant free shampoo instead of conditoner only washing.
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.