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One has nothing to do with the other, you can run 1200rpm at 500fps, it's just not recommended.
Anyway 350fps is FINE for that high speed, it reduces impact force on your gearbox shell, and fps has little to do with range. I get fantastic range with my UMP and it only shoots 280fps.
Now there's many thing that can cause an FPS loss, wrong cylinder, O-ring on the piston head shrunk, bad nozzle, hopup rubber not aligned to nozzle, poor installation of hopup rubber, bad piston head.
I've had a gun lose 100fps very consistently due to a bad nozzle
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