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Take off your upper receiver and fire a few rounds in semi. Make sure that the nozzle ends up in about the right place, or it could potentially be causing feeding issues. Active braking can help with this.

I've seen instances where the nozzle stuck, or even the tappet timing was off where the nozzle would return and extend in the wrong places. The nozzle could even be pushing BBs too far past your hop rubber.

Do you own a chrono? Some chrono results would be really helpful.

Look up the silicone cylinder head buffer mod. I've found it to be extremely easy and useful. You can add more material than you need and correct AOE exactly with a razor blade, it's a soft buffer, piston sound is a lot better, silicone immediately returns to its original shape, so your FPS will be more consistent. I've never had any damage (yet) either.
 
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