Your comment on trim tabs is interesting.
When I fitted them to my Seafarer Vagabond or actually Seafarer fitted them I was advised by Lindsay Fry to fit 9 by 9 and not bigger ones. I certainly run my twin 115 hps trimmed further up even with the tabs fully raised. The Raker props (20') dont mind surface piercing either as opposed to Vipers or similar.
Ranmar850 's comments really ring true especially when one speeds up and with minimal tab down and the boat level side to side a Vag bow really does punch thru waves and with the twins and a bunch of heavy batteries etc it does land stern first not that I try and get airborne with it.
Interesting topic anyhoo, and it does reinforce the fact that one never really learns all there is to know about getting the best out of ones boats.