Well I have a 1997 Challenger with a single 787, and a 08,200 speedster, with twin 4-tec engines. I'm not the faint of hart and have raced FAST stand-up jet skis for like 10 years. I feel real comfortable getting pretty high off the wakes,(15'-30' on my stand-ups) but if it's done wrong it can cause some heavy duty damage. On my jet boats I get about 6'-8', and its something I built up to to learn the boats feel airborne. It's all in the timing and landing. I would suggest you take it slow and learn what feels like a soft landing and build from there. I wouldn't just start jumping like 5 feet out of the water with out starting out smaller. I have seen 14' jet boats almost flip over back words off 3' swells because of the wind. Be careful and take you time.
Karl