From your description, the gun is appears to be getting just enough gas to work, most of the time.
Doesn't look like the gun is losing gas from the port, all the barrels I've ever seen look just like that.
There is some gas loss from where the gas tube enters the block. Sometimes, this resolves when the gas tube gets enough fouling around it to seal off.
Your gas port could be too small, but I think that's on the less likely end of probability. It's more likely that the gas block was drilled out too large where the tube enters.
How easy was it to remove the gas tube from the gas block?
Retired USASOC WG-6610-10 smallarms inspector
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