Before you do this check with someone who knows because I am by no means a boat mechanic, but this is what worked for me. I have a x19 with the 175 sho w/10" manual jackplate and had very bad porpoising problems at first. First I put a 10" hydraulic jackplate so I could easily make adjustments, that didn't really solve any of the porpoise problems. Next I installed the 23p Tempest plus, that helped some but didn't cure my problem. As a last ditch effort I installed 1" spacers between the jackplate and the motor. I figured that setting the motor back farther would help keep the bow up. This has solved my porpoising problem, it no longer porpoises at any speed and it doesn't matter if I'm loaded heavy with fuel or full livewells. It will still porpoise if I have the jackplate set really low but it works fine for most of the range of jackplate adjustment. I did some basic calculations and that 1" extra setback shouldn't put anymore stress on the transom than a 200lb does with a factory 10" plate.