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No problem, with the testing I did with my boat (12.5 ft wahoo, 40hp mercury). I first started with no trim tabs or hydro foil. By raising the motor up 2 holes or 1 1/2 inches it performed much better, faster out of the hole and better top end. Then I added a hydro foil, could plane out faster and stay on plane at slower speeds but lost a few mph's. I did try to lower the motor with the hydro foil on but made it even worse. So I removed them and tried the smart tabs, faster out of the hole, plane out slower, carry a heavier load, and gained a few mph. It had a small problem with a full tank of gas and three adults in the boat, would not plane out. So I ended up putting the hydro foil back on with the trim tabs I can now take 10 gallons of gas, 3 adults, and extra stuff and the boat will plane out and do about 27 mph fully loaded. When I alone in the boat it does about 37-38mph