How to get lots of pop?

I have been boarding behind a I/O for the last few years without any real pop off the wake. I've always thought that it was because of the boat. However, I have been riding behind a mastercraft x-starv, lately, and I'm still not getting any real pop. I can only get distance. I want to be able to get high into the air, so I can do better tricks, and I it seems that I can't do that. I have tried many different things to get pop and none have worked. I ride a L.F. substance 141 and the fat sacks are always full. Please, feel free to offer suggestions on how to get nice pop off the wake, thanks.