Hi,i am from cairns australia I have a aluminium 19 foot cabin boat 130 yamaha 2 stroke with the weight of 2800 pounds with no one on board. With a lot of weight at the rear as in extra fuel and duel batteries pumps and so on. In the water it sits down in the rear a little to much but sits flat ( not to one side )when sitting still. I know the trim tabs will get it out of the water better ,and stop the slight porpoising I have, but on the move around 2500 to 4000 revs the boat does not know which side it wants to lean to no matter what weight you move round in the boat (remembering it sits good when still )and at full noise it rides good. I do prefer the stainless steel tabs,but do you recommend any of your tabs for my problem.I was thinking the ST1290-60 or ST1290-8o, but what do you say.Thank you Peter Spertino.