Ask that question here,
http://www.bbcboards.net/zeroforum?id=42 I ran a Yamaha T-1 25P 10 inch hydro jack platte, 72 on top end, if you stick with the static platte start at 2.5 inch below the pad, then come up about .25 inch at a time, watch your water pres, Yamaha 250,,, Most run the Tempest 25P on that set up,,, Mine was an Intracoastal so it had trim tabs on it, helped A LOT at slower speeds,,, and you are correct that boat likes to run, the faster the better,,, fill it with gas and spend some time in the drivers seat, you'll get the hang of it. Don't see too many Z21's with 4 blades