Well, my local marine store recommended trying a Hustler 12×10-1/2. Tried it out at 8600′ and much, much improved. Was able to just reach 5500 and 26 mph but I had to trim to just about cavitating to hit that. When I made slight turns it would briefly cavitate so I had to trim down in turns. Also, riding into the wind and chop I couldn’t quite hit that 5500 RPM. Talked to my local dealer and Turning Point (Hustler manufacturer) and they both recommended going to the 12.5 x 8. My local shop told me they would change it out for me. WOT on the Merc 60 is 5500-6000. I’m hoping I can hit about 5700-5900, be able to trim the leg down a little and maintain at least 25 mph, which is fast enough for my needs. I’ll post again after I try it out early next week….