Just keep doing the smaller ones flat based until your not uncomfortable anymore... do not go off an an edge please, I kringe when I see this. Those making the comments like that may have found it works for them but 99% of the time I see people do this they are off balance in the air.
approach flat, stay flat, pop flat, land flat... end of story.
I said toe edge, not either. popping off your heel in a straight air will more then likely throw you off balance, while popping off your toes is much more natural and easier to keep your balance.
popping flat base just doesn't make much sense really, plus i find its easier for your board to pivot by accident when trying to keep it flat causing someone to catch their edge off the jump.