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I think brass ejection direction and it's violence of action is a good general determination of what's going on with the rifle. If you shoot alot, the recoil impulse can also give you a feel of if something is off.
What makes it do that depends on a large number of variables. Some of which I talked about earlier in this thread. Since you are dealing with a percentage of diminishing force traveling a constant distance and volume from gas volume of the cartridges expanded powder burn, your ammo and it's load, powder type, can greatly offset the weapons gas balance.
I dont know if you tinkered with the OBRs parts or not, but it may be designed to be tailored to very specific loadings if it's a factory setup. Once you start changing things it will get more complicated.
Again, being over gassed is not always terrible either as far as reliability is concerned. It will have stronger affects on parts wear and follow up shot times. It really only becomes a big concern with suppressors and no where for that gas to be vectored but in the shooters face.
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