need more pump pressure in the suction housing. i added 1/8 shoe shim along time ago i thought it was working well but was pulling boat down into water at times . so it was back cut 3*. it was originally a strait cut shoe. had 45psi at wot or max at that time. after back cut 3* it dropped to @ 35 psi . now after doing the bottom & possibly adding a little more glass & the fact that i have more hp or both, i have 0 psi wot, 20psi at most at unkown rpm,had to shim the loader to get that. pre-shim was 10-15 psi ,couldn't see well... .................so shoe is @ 1/2 above keel ,should i drop the shoe or build a different loader,drop the leading edges down ? anybody got any theorys or info ? remember this is a v-bottom with a gth low-pro intake......... one thought i had was to machine where the ride plate meets the shoe & machine the shoe so the ride-plate has a step up . it would keep the boat from riding too high out of the water & push the shoe in further? could shim the ride-plate bolt area . this would also cause a aerating of the water at the step for less drag!?........p.s. i don't have a spoon on the bottom that i could tell.
That's a pretty short transition from the hull into the I take. Water will have a hard time making the turn into the i take which would explain why you had to shim the loader and shoe down to get more intake psi. Might be the angle of the photo though.
If the boat is driving up out of the water too far then a back cut shoe only makes that worse.