I CAN'T GET AIR!!! PLEASE HELP!!!

Hi, I have been riding for about 4 months or so, and I have become attached to wakeboarding. I ride a foam Belmont 134, and I have a fairly good sized wake. Unfortunately, I can't seem to get very high on my wake jumps when I go heelside ( only about 4 - 5 feet), and I can't seem to go far on my toeside jumps. I know that I am supposed to load the line, and keep edging through the wake and then straighten my legs at the crest of the wake, and I do try, but I never seem to get the type of height or distance that I am looking for. Does anybody have any tips on how to get better at jumping? I will sometimes get a big jump where I get a nice pop off the wake but I can not seem to get this to happen very often, so if anyone knows what I may be doing wrong, please reply. I'll take any tips, just please help me!!!! Oh yeah, I know I'm supposed to load the line but how do you do this???