prop help
 

I have a 1998 baja 272 w/ 502mag bravo/dr not sure of gear ratio. I'm running a mirage plus 23
Here inlies my question / problem
Top speed 69 Great
plane relitively fast
0-40 reletivley fast
40-69 no in between the motor revs at 45 from 40 mph trimmed out all the way to wide open it seems as thought there is no middle to the prop I heard a 22 hydromotive would be good but I also heard I need a 4 blade 24-25 pitch can some one help