I've got a 20ft Can-am jet boat with a Berkeley jg(i think) jet. I'm wanting to get the most out of the jet with my new motor. Cam makes power to about 6500. We rebuilt the jet 10+ years ago and right now with a AA impeller it turns 4600 and was thinking to go with a B impeller. Anything else that would make a big differ? Thanks. Just a lake boat...