We purchased our Islander new with a single 250HP OX66, in march 2002. Had 465hrs on it when we repowered to twin F150s in Nov 2005, and now have 890hrs on the twins.
We have a lot of experience in snotty seas, both offshore and in the great Chesapeake Bay.
I have found the best approach to drop the engine trim just a little - not all the way down - then use the tabs to bring the bow down so that sharp, deep V up forward is cutting through the oncoming seas.
Yes, it can get a bit wet (we leave our curtains up all year), but it doesn't pound.
Brian