[flyingfrizzle]

From what I found on my 20'bracketed seacraft I ended up at 3.5" above the keel with a 24" setback so it sounds like you will be about right with where you are planning to be. I started out and tried some different heights and ran as high as 5" with a simi-surfacing prop. At 5" it was squirrelly feeling and slipped when I trimmed up too high. It needs more than the +1" inch per foot rule so a low starting point of 2.5" is good and you will go up from there and find out between 2.5" and 3.5" is best for the 20'. I would try to mount the tub as low as possible too, that will give you more flotation at rest which you will need along with moving weight forward to regain balance. The weight of the bracket moves CG too far back.