Be careful when making assumptions.

If you are increasing the righting moment with 15 % than the beam will be under 52 % higher loads (if my memory serves me right)

I can do the construction calculations for you; please take a look at them before you make-up your mind.

IF the free beam is to weak or to felxible than fitting a dolphinstriker will be a good alternative. These things make alot of difference.

WOuter