I never tested the 19's but I do have a set of 16's OFS4's, they are smooth and push our heavy heavy boat nicely, we run heavy all the time and we get all around avg of 1mpg with all the weight. im not looking for speed, im looking for good bite and get up on plane efficiency, my motors live at 4400-4700 rpm, get 33-36mph depending on conditions, im very pleased with the powertech props

I have a 2004 32 Reg that I'm repowering with yamy f300's. I see that you mentioned Powertech props. The dealer sold me the powertech 4 blade 19 pitch props. Curious whether you ever tested these or what you ended up running? Any info would be appreciated.