I own a 17' 2001 Logic with a 90hp. Johnson Ocean Pro. I switched props the following weekend that I bought it to a : OEM Johnson SS stainless prop and it changed every thing! I went from 35mph. at 5000 rpms. to 43mph. at 5900 rpms. The stainless was a lot more $$ but, I gained 8mph. and a whole lot more trim. The alum. prop flexed so much at high rpms. that it lost pitch and could not pull the bow out of the water with two people on board! It became so much easyer to steer at higher speeds. No more bow plowing for me! 2001 was the last year for Logic.......R.I.P. The reason that I say that is because they are no longer rated for a Max hp. of 90. I asked a Triumph dealer at the Ft. Lauderdale International Boat Show why the newer 2002 Triumph boats didn't have the same horse power rateing and he said because they were useing a smaller steering wheel and it couldn't take the tourqe of a 90 horse.
I hope all this helps you a little bit? Good luck with your boat!
regalloway@earthlink.net