I completely agree - it seems that there is always a steep down slope just over the edge of the bunker, between me and the pin. I have found, at various times, that FBS will work on Full, Punch & Flop shots - the ball will stop - unless there is a slope where the ball lands.
My biggest problem is deep bunkers with 5+ feet of elevation - still looking for tips on how to play out of these monsters.
Yes, thank you in advance, I have had TONS of practice, but as the OP said - there doesn't seem to be enough back spin to stop the ball.