With any extra weight, it will begin to bog down and slow down your hole shot. If it were mine, I would go with the 22" and keep the rpm up near the max, so when extra weight is added you don't bog down.
According to TP, the only difference in props is blade thickness which I doubt would change WOT 100 RPM. I ran a 24 P SS Ballistic on my 17.5' stepped hull alum BB, picture of it in my Avatar kissing 50 at around 5600 RPM. Rev max spec. is 5500 but I don't have a problem running over it.
"Running a SS prop on a 90hp motor is futile"
Stellar is empirical.
I gained 5mph, a much better hole shot, and low speed handling improved when I went stainless on my 16’ Skeeter with a Johnyrude 75 hanging from the back.
The Ballistic was bought at a decades old marine dealer that had a wall full of props and thrust washers. Paid $200 for it. My TPs all ran just over $100.
"Quantifiable" may also be subjective. Sure, speed improvement is one data point, higher mpg is another. But hole shot, maintenance costs on the sandbar and bow rise are not as easy to determine.
Didn’t answer the question….. quantify performance over comparable aluminum prop
