1990 Convincor GTX
Was 330hp 454, now stock 502, 415 hp.
Was running a mirage plus 23p with stock 454.
What should i go to now?
What does this boat like?
Pitch for new motor.

I would try a Hydromotive IV. Many checkmates run well with them. See if there are any prop shops in your area that will let you experiment. Also look at your RPM levels, I would venture a guess that the 330 and 415 could be at different RPM's ?

Ocean Performance, which is close by, has Bravo 1's for demo.
Might try one of them first.

Try a 24 Hydromotive or Bravo. The Hydro is more like a 25 due to the way they measure pitch. I ran a Hydro on my Check and it was a vast improvement over the 3 blade I had. If you can try a Bravo free go fo it, have know some who liked them as well.