My son was having this exact problem just recently and we went to private instruction as a result.
Here's what we learned:
The whipping off of jumps is caused by going up the face sideways, stabbing the throttle on the face or sometimes ruts in the face (his problem was the first two). It sounds like you're problem isn't the jump but the turn before. You've got to get the bike under control coming out of the turn and being going basically straight on the face (at least for novices). One thing that may help, try leaning the bike more to get through the turn faster (and take a tighter line) leaving more space to get straightened out ahead of the jump.
The other thing that makes a HUGE difference in the event you do get whipped unintentionally in the air, land on the gas. This is the single biggest thing I've learned to do that takes the blow of the landing out and also greatly reduces the chance of a sideways jump resulting in a crash. My son was going sideways, getting scared, and landing dead on the gas. Now that he's been better taught, even when he does whip a little, he's not crashing. Hope this helps.