When you say it like that it sounds like you are propped well. If you can hit the recommended WOT trimmed out with the current prop then what are you looking for in your performance?
I have an American Standard Champion. The toilet works great except the flush valve seal gets osmotic blisters every six months causing the toilet to ghost flush. I went with a more expensive flush valve seal and the problem seems resolved. I have yet to flush any golf balls though.
I found this thread from 2010 on the 1962 SeaRays.
And another thread.
https://clubsearay.com/index.php?threads/in-my-absence.91735/#post-1045777
https://clubsearay.com/index.php?threads/1962-808-cruis-a-bout.27123/
Odd, the pictures did not load when I first viewed this topic.
Looks like this is powered with an early 70’s mercury outboard. Those down riggers are giant. Was this boat used for fishing on a lake?
It may seem a little pricey but the OEM SeaRay mooring cover will be a perfect fit and is very durable. Mine lasted ten years and I purchased another identical cover in 2022.