First off I wish to thank you for your service to our great country Sir.

Now pertaining to your post. Do you have large hands? Hitting low left of the bulls-eye sounds like a classic case of too much finger on the trigger. This will cause you to push the pistol down and left as you squeeze the trigger. Try engaging the trigger with just the pad of your finger tip. Your second problem may be caused by you not allowing the trigger to come forward far enough to reset after the shot. As for the few stovepipes, is it possible that you "limp wristed" the pistol on those occasions?

Now I know it sounds like I'm throwing all the blame on you sir and I mean no disrespect. You certainly are more experienced than I am with the model 1911. I don't know how much experience you have with modern polymer framed pistols. Polymer framed guns have some unique quirks that only pertain to them.

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Life Member B.A.S.S., NAFC