[Putershark]

I would relate this as "P- Factor" and is the same reason why a Helicopter has a tail rotor and why when taking off in a small single engine prop aircraft, you have to give her right rudder to hold her straight http://en.wikipedia.org/wiki/P-factor.

You are putting power to the prop and the torque of such, is causing the boat to list. Much more common on a 210 series than a 190 due to the deep vee hull and power these engines when propped correct or under propped can produce My old 210 with that monster 200 HPDI was bad about such till I worked out the under prop issue.

First thing I would check is to make sure you are not over-revving that engine when at WOT. It may need a larger prop to back off the RPM's some, which will also give you better launch and lower cruise (less fuel burn) RPM's at the same time.

Also I have seen the cavitation plates like the BMS model (the search tool on the home page will help you find those threads) help negate such by creating more stern lift. After installing such first, which is got to be one of the best ROI upgrades you can make for 30 bucks to any Triumph hull I would then test how your current prop reacts and then if needed, either install Pro-pulse prop with it's adjustable pitch or swap out a few stainless 3 blades models till you get it all dialed in

Lastly would I would not spend the money to install trim tabs (though a great tool) to correct for such due to the cost. Trim tabs can also become a expensive band-aid and force more drag on the hull to correct (cover up) for a condation could be more prop / power related that still needs attention, but is no longer as apperant now that you have the ablity to drop a tab down and add drag to fix.

Hope this helps some?