Even though less air is coming in and therfore less fuel is required at altitiude for a given throttle setting you also have to run a higher throttle setting to compensate for the power loss. When running upwards of 9000 ft power will be down MARKEDLY...rule of thumb is for N/A internal combustion engine is 3.5% for every 1000 ft of DA...
With that said Polaris EFI will compensate for altitude but I wouldn't be suprised if it doesn't have range of self adjustment to have a perfect mixture at 9000 ft above sea level..way better than a carb jetted for sea level though.
You might want to look into a clutch kit set up for altitude.?
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