The level 10 is the best upgrade against chopping. Force feed hoppers will help as long as they always have paint. Its when you run out of paint that they become just like any other hopper and cause you to chop. That usually happens in the heat of battle when you aren't paying attention to the paint in your hopper.
It isn't that difficult to tune a level 10 bolt system and keep it running. Most of the ones I have done involved just the original tuning and usually run for years without any intervention until an oring wears out. Then you replace the worn oring, tune, and go again.
Except for the Automag in front, its usually the man behind the equipment that counts.