Mate your 400+ to one of these http://www.donzi.net/forums/showthread.php?t=62422 with a bit of a raised X, you will go faster than a Bravo and have a bullet proof package. Not only will it be bullet proof it will not chine walk one iota, it will handle similar to Youngers boat but end up being a better all around package not just dedicated to top end. Dou prop setups are the most stable of all at high speed.
No matter what your beliefs are "GOD BLESS AMERICA"
Fully retired marine tech near 60 years in the biz.