1997 Gambler 209te(21 footer)
300xs mercury sportmaster gearcase 1.75:1
12 inch bobs hydraulic jack plate.

I typically run a 28 bravo with 4- 1&1/8 or 4-1 inch holes and 4 pvs holes-all open.
This 29 tempest plus is blowing out so badly i can't get on plane.
I put in 2 pvs plugs with 1/4 holes in it and no change, it even spit out one of the plugs!
I tried stuffing the jack plate all the way down and it made no difference.
I also run a pro max and it cavitates some but hooks up and launches like it is supposed to.
This tempest has me confused.
I appreciate any suggestions.