I have a back cut shoe on my V bottom boat.
http://www.hotboatpics.com/pics/data...oodinstall.jpg
As you can see in the photo, the keel line and the bitting edge of the shoe are at the same level. It's hard to compare to my other flat shoe because for one it was hanging down farther then it should have been, and with this shoe, I had the intake reset and a different motor, so I couldn't tell you the exact changes. Even before the bottom work to the hull, the boat seemed to lift more at higher speeds. One big thing I noticed was when your at speeds 80mph and above and you begin to let off the gas, you have to do so ever so slightly because the back end will want to continue to lift sending you on a wild ride to calm it down. It takes some getting used to and you can slow the boat down safely, but just not as fast as you used to. You could also trim the shoe by a 1/16th making it shorter which will make it easier to slow down from those speeds, but then you loose some of your bite, which makes the boat slower. I know because we tried that and I didn't like the loss in mph. So I got a couple of shims (1/16th and 1/8th) so I could put it back to where it was, or lower it from where it is in the photo by another 1/16th, or even an 1/8th when using both shims.
HBjet