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A lot of those "upgrades" have detrimental effects, specially if not done right.
Also the Co2 mags have restrictions inside them: under equal conditions a Co2 mag delivers less energy than the propane mags. In cooler weather the Co2 may be a bit more stable than propane but not by much (those 12gr cartridges don't have enough volume)
Installing an NPAS will help with cycling properly by directing more gas to the action.
Using propane mags with a cold-weather friendly gas like MAPP or Nuprol.
There could be something broken too. Common problem would be a cracked nozzle.
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