You are losing ALOT of RPM's if you have a 25" shaft on a 20" transom. I have seen as much as 400-500RPM increase in raising an engine just 2 inches, let alone 5 inches. Get your engine to where the cavitation plate is level or just above the bottom of the hull before you change props as you could see almost 1,000 RPM's by raising the engine up 5 inches(I used to get a good 1,000-1,200 when I would jack up my jack plate on my flats boat).
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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