Do you mean WE Hicapa? To my knowledge, WA does not make one. The TM Hicapa build (duplicated by WE) would not be compatible with a flow restrictor.
If you have a WA GBB, does it work better with a slightly cooled mag? If so, I guess that your hammer spring isn't stiff enough for propane and is light striking.
Do your WE 1911 leak gas while filling like most Japanese GBB mags do? If not (silent refill like KJW) then your GBB has single port fill valves which do not assure consistent fill. You will find that cooling your mags for about 5min in the fridge before filling will help.
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