I'm having a very similar issue... I got used to a super flexy full rocker board (Forum manual 156cm) with which I can ollie pretty high, in fact i have to actually control it on lips so as not to over-ollie. However, for pop jumps i'm super unstable and sketched out specially on the landings.
When i'm riding the stiff all mountain board (Endeavor live 159 cm R-C-R) (i'm 170 lbs) i definitely struggle for height on ollies, but it feels great to pop (which i'm still working on, but the feel is definitely much better)
I think the difference is with a soft flex board you can apply enough pressure on the tail using leg power alone, while on a stiffer board you actually need good ollie form for a decent pop (good ollie form = correctly loading the tail by shifting your center of gravity towards the rear PLUS leg strenght).
This correct shift of weight is something that needs pretty precise timing and body movement to dial in... i am still struggling with it, but i think i'd rather have stable pop than super high ollie power.....
Last edited by F1EA; 01-27-2014 at 08:29 PM.