Yeah, high speed gears sound like the first thing that should go in the setup.
A Flat or Torque Up gear set will lower your RoF (torque up isnt really necessary for these springs, but it'll work too). Spring can stay as is, as MadMax pointed out, stiffer springs wear stuff out faster. Maybe even go to a 8.4v pack and a 140% spring, and tightbore inner barrel.
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