I would say that the trigger spring mod is 100% the culprit! When you do a mod like that you should work with it only cutting about 1/4 of a coil off at a time as not all rifles are the exact same with how they'll react.
To fix it you could go two ways. Get an actual after market trigger either the Timney or Rifle Basix. Or a couple of the guys on here have picked up a new spring from their local hardware store.
Personally, I'm running the Rifle Basix Trigger on mine as I believe the internal workings of a firearm should be modifiied with products designed for said firearm. It's much safer in the long run.
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