For what its worth, the "bounce" is what I wanted the ERA for. In my newbie opinion, once a guy our size gets the skills to carve at will, front slide, switch, etc....the next logical move is to start to jump. At our weight, it is not quite as easy to get that pop off the wake, especially if the boat is not throwing a monster wake.
I wanted a 3 stage board for the exact reasons you are struggling with it...I wanted that pop to get airborne.
Again, for what its worth, I would try a large fin setup first.
The only other thing I can STRONLGLY suggest is to spring for the entire "The Book" dvd series. Your son will love it, and it will help you tremendously.
Its $100.00, but the way I look at it..
1. By using proper technique, you may find out that you love your current board...which may save you ten times the cost of the DVD.
2. It costs at least $75.00 per hour to be out in your boat, not to mention that the time with your family is priceless. If you can cut your learning curve by 10 riding hours, and have a blast in the process, you can easily justify the extra expense.
Just something to think about.