I have a zodiac futura mark 2 with a mercury 40 hp outboard (max horsepower the boat is rated for). With two on board, it gets up on a plane pretty well and has decent speed. With more weight, you have to do some creative passenger placement. The boat still gets up on a plane, but is noticably slower. I've seen where companies are selling trim tabs, and claim that they have a noticable effect on ease of planing, as well as top speed. Are these things worth the money? Will I notice enough of an improvement to justify spending the bucks? If so, any recommendations for which tabs to buy? Any advise you can give would be greatly appreciated.