I am in need of an education on labbed props. I currently run a 28 that’s been repitched to a 26 so I’m guessing it’s around a 26.5. I’m running 5100-5200 on the HP500 so it’s right at the stated max RPM. Would I benefit on the top end from going to a labbed 26? I have always been under the impression to improve top end you would go up a size and go to a labbed prop(so for me a labbed 28). Thank you for any and all info.

What kind of boat? I can't answer your question but am in a similar boat turning a stock B1 26. I'm running around 24% slip and looking to reduce it on a 253 Convincor.

21 Schiada River Tunnel. The slip on my boat is around 7-9%

Probably not a labbed 26 will be easier for the motor to turn and will give you more rpm's you would be better of trying a stock 28 and see how it runs and then have a 28 labbed for your application and get you to the right rpm.

I'd take those slip numbers any day.