You can't really make a decision on what techniques work if your products are not CG. Silicones for many of us either drag down curl or leaves you with ill defined curls/ frizz or both, whereas a styler/ gel very much helps you create and hold clumps.
I picked up one technique/ product at a time when I started, until eventually I came to accept CG works best as a full system, with logical modifications if that is not working. You are identifying that you need mineral oil to seal, yet you are already using silicones to seal. CG hair clumps due to hydration but you are not using the products that work towards that goal.
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.