I run a LaserII 21P with a carbed 90 on my 750D, it is about right for that. I think it is a 48-899006. I don't know if an Opti can twist a 21P on that one or not. Mine came with an aluminum and I found mine on line and saved a bunch of money. I would not pay $450 for the small performance improvement, though I can tell the difference.
I played with 3 different pitches and found 23 gave me the best hole but also put my mercury at the right RPM at full throttle.I get on plane in seconds with WOT and trimming out at the same time.Boat load will play a part and having everything balanced out weight wise makes a huge difference.