I think diffusing is important for overall volume but clipping is the only thing that guarantees root volume. I can kind of tell after I diffuse if I need to clip. If things are looking flat, I clip or use some small jaw clamps for 10 to 30 minutes and that does the trick. I pineapple at night and that gives me plenty of volume for 2 or 3rd day hair.
2b/2c ( weather permitting - 3a), fine texture but lots of it, colored and highlights, BSL.
Experimenting w CG since Oct 2012

Current rotation:
cowash= TN
AG Gel Mousse, LA Gel,
DT = Coconut oil (love)