Another Prop Newbie looking for help
 

Looking for advice as my previous boat was a jet so i'm Prop ignorant.

Boat: 26 ultra shadow deck/cat boat supposedly should be doing about 13% better mph @ 5100-5200RPM.
Engine: 496 HO

My results

First prop: Bravo 26P WOT 4600 RPM 66-67 MPH-GPS
2nd Prop: Bravo 24P WOT 5000 RPM 64 MPH-GPS


It's been suggested to try a Bravo 26 Labbed prop. Curious as to how/why this would be better. Any other suggestion or help is greatly appreciated.