heeelp...how do you do frontside cutbacks without stalling?

As some of you know, I don't have the greatest board (7'9" plastic Bic is my small wave driver).
I've been working on frontside cutbacks for a while now, but I still have a hard time turning the board decisively back towards the breaking part of the wave. So far, what I do is try to push the tail down and turn with my arms. Sometimes it works OK, sometimes it doesn't. Any attempt to lean causes the board to stall. Granted, I have been trying this mostly in mushy waves where there actually is no need for a cutback as I am already in white water when I do it.
But anyway, I feel like I should be able to get the board to turn faster, even my current board. Any tips welcome especially from longboarders who ride crappy waves.
I've been working on frontside cutbacks for a while now, but I still have a hard time turning the board decisively back towards the breaking part of the wave. So far, what I do is try to push the tail down and turn with my arms. Sometimes it works OK, sometimes it doesn't. Any attempt to lean causes the board to stall. Granted, I have been trying this mostly in mushy waves where there actually is no need for a cutback as I am already in white water when I do it.
But anyway, I feel like I should be able to get the board to turn faster, even my current board. Any tips welcome especially from longboarders who ride crappy waves.
