The Lavey is longer and heavier. You can make your boat heavier which will help displace more water but longer is going to be tough. You could strip it bare and add reinforcement at the stringers and bulkheads but that would be a major project that would yield nebulous benefits. Remember, if you subtract the beal and the swim platform you're going to have to compare your boat's performance to something in the 25-26 foot range to be fair. As far as going faster- sometimes the water doesn't cooperate. If you get some odd spacing between swells and stick the nose into the face of the next one, you're going to hurt yourself and break your boat. Skill and experience has alot to do with it too.