Trying to set up the surf wave on the 19 Supra SL and need some help.

Stock ballast +500 lbs of PnP in each rear locker and 200 lbs of lead in the bow and 200 lbs in the surf locker. 11.3 mph. pitch around 10 and -2 on regular and 4 on goofy. Wave is tall and big but would like a little more length. tried going faster but lose push in the back. Surf plate is at 30. Thanks.