Jarrod,
The patterning toward the left can be related to trigger pull. The Luger's trigger pull is long--I don't want to say "creepy" or "spongy"--and as your finger flexes to take up the trigger travel your hand wants to follow it and rotate to the left (for a right-handed shooter).
Pay attention to how your finger and hand moves as you press the trigger (not necessarily dry firing, just exercising the trigger finger) and find or practice a motion which makes your hand move the least.
--Dwight
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