PC-20,
I went through about the same senerio with my 21' Omega open bow. Bout the same power & weight. The snoot picked up the top end about 6 mph, but it went along with some changes in set-up also.
Heavy boats like a larger nozzle & impeller. The way Duane explained it was:
"more water out the back, more weight forward".
My suggestion would be call Duane and talk to him about it. He's set up quite a few boats now with the snoot, and can sure guide you through it.
Who chromed your pump for you???? I've been looking for 4 months trying to find someplace to do it!
Ken F