I posted something very similar in the 3b forum a few weeks ago... my hair looks very similar to yours. I can get volume by using products with glycerin, but then I get the frizzies along with the volume! If I just leave it alone, I get really nice spirals... but flat roots.
I've tried clipping, plopping, etc, but I have to choose only one: Either definition or volume. I can't seem to have both.
3a/b fine, high porosity, medium density. Mod- CG
Low-Poo: 50/50 mix of EVOO and L'oreal EverSleek
Co-wash: TRESemme Naturals, or Suave naturals
Leave in: TRESemme Naturals Radiant volume
Summer styler: LA Looks sport gel(summer only)
Seal: Liquid lubricant/water
Winter styler: KCCC, AIF, Beyond the Zone Noodlehead curling creme(not CG)
DT: GVPCB, coconut oil
Embracing(or trying to) my curls.