pete, i used to have the same problem you are having now.
it's been mentioned a few times already in this thread, but i'll pipe in my .02 as well here.. basically, you just have to start your movements a little sooner..then exaggerate them a little tiny bit more.
example1: a big aerial nosestab : you basically just cruise up the face of the wave, then as your about to take off you do a little body english to get your ski turning in the air (no need for details, i'm sure you know what im sayin)
example2: a barrel roll : you want to throw your weight / lean forward almost before you leave the wave. by the time you leave the face of the wave, you should already have alot of motion /body english going on. like jetskier79 said, bars cranked to the point of destruction, full on throttle, chest/torso leaning forward and to the side you're rolling.. and dont forget the S dance.. that is the KEY.
once you get the hang of just doing rolls by basically falling off the back of the wave (no big air required), then you can focus on the AMCF style of BR's.. big launch, then BR.
when i was learning to BR, i'd watch Malone on Freeloaders over and over. There is a slo-mo clip/close-up of him doing a BR that still freaks me out. he basically launches off the wave, waits a second or two, then initiates his BR while in mid-air. how he does that , i have no idea!!! but it helps you see the form and body english.
basically, when done 100% right, you're just hanging on for the ride in a BR. every wave is different though, so, you have to adapt for each one. you're almost there. i remember how mad i used to get when i was in that spot. keep pushing pete!!!