No youre not going to be able to turn a 27p Trophy. Maybe a 27 Tempest at best, but with the load youre talking about not likely. Losing 1.5 mph on top end is due to raising the engine on the jack plate too high. The boat is now running flatter and youve lost some bow lift. The rpms picked up due to prop slip. Bow lift and prop slip go hand in hand. The flatter you run, the more prop slip. Personally, I would learn how to drive the boat, then lower the engine, and once you get it figured out your top end speed will be at least 1 mph more and possibly even more. Would surprise me the least bit to see at least 75+ out of this one.