Ok. How do I tell what gear ratio I have??? SN? Stamped on gears??

With those props and that hull, no way are you at 9% slip. If that would be the case, someone did a hell of a job building & setting up that boat. As for gears.. All XR's have 16/19 gears in the upper, there is several different combinations that can be done with upper & lower gear sets on bravos... If you don't have an XR upper you could have like 4 different ratio gears in just the upper, then there are 3 different ratio's in the lowers for sporty's XR's etc....... You have to count teeth to find out what ya got.

and 18 percent slip to do those numbers at 1.36, man I don't know. 9 percent is hard to achieve on a v bottom, and 18 is too high for a stepped fountain. 13-14 is about average.

Like bawana said, 9 percent would be sick prop, lower and bottom work....but it is possible.

You can count gears, or you can pull the drive off and rotate 10 times and do the math on input vs output

On my 38 Fever I went from a set of XR sportmasters to a set of -2 imco's and it picked up about 5mph. I did however have to add a set of pressure relief valves because the pick up for the imcos are so much larger. The boat ran best and fastest with hydro P5-X's.

you don't have 1.5's. I run about 11- 12 slip with Herrings. Same hull, everything bluprinted. And that's a 5 blade. You having a 4 blade is gonna be higher than 12. Plus you are probably real deep in the water creating drag.. I'm thinking you are in need of better set up and props. You should be around 15 -17 slip with your set up. so 18 makes sense