I need some input. From my profile I have a 20 foot open bow, 4.3LX Mercruiser, and a Alpha One Gen 2. I currently run a Solas Rubex 19P, 14-3/4, 3 blade aluminum prop. At WOT I am hitting about 4400-4500 rpm and hitting about 35mph. If I drop the money and go stainless... what are the gains...