adam,
check out this
thread . I am @ ~3" now and the boat is hooked up in turns and in a sea. The bottom of my bracket tub is ~4" above the keel. I no longer run the dolefin but I dont doubt that it may help me not drop off plane @ low speeds.
WOT is 5800 going 42mph
with a 15x15 alumn BRP prop. Thats with 2 guys ~50 gals of gas. The full tub bracket makes the boat jump on plane.
....and yes I have been Tuna wishin
and just enjoying the boat and the fishing.