A dirty air intake spark arrestor screen could certainly restrict your WOT performance. Due to the air restriction, it would be like not being able to push to full throttle. However, the dirty screen would have less effect on low end torque...which you seem to be having an issue with as well (trouble getting on plane). Cleaning the screen should be done at least once/year or 50 hours.
Someone else with Hi-5 prop experience might chime in to tell you if the same pitch prop was the right choice, or if you should have gone with less pitch. I can't say, but my guess is the same pitch would not cause this problem.
I would also consider if you have 1 cylinder not operating. Removing and examining your spark plugs would tell you this. An engine will still run smoothly if 1 cylinder is not working at all. It only runs rough if the cylinder is intermittent.
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"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings
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