05 Ranger 519VX and 2016 Suzuki DF175 with 8" manual slidemaster

I will be setting up the boat above....Have a PT RKR4-25 on my old Stratos FS the motor is coming from. I've read enough to know this isn't the right prop. Anyone with direct Suzuki knowledge on a Ranger and sort of where to start? I'm thinking a 27p cupped prop. I don't have the motor on yet, so I don't know any specific measurements just that I'm 100% confident that my 25p isn't enough and stretching it to 26 probably isn't enough either. I've read of guys having to go to 28-30p due to the gear ratio of 2.50:1 of the Zukes. I'd rather my WOT not be pegging 6100. More like 5800-5900 maybe.

Tia