I know this will sound funny, but quite possibly your arms are not the same length. My wife had a very similar symptom and she got measured and found out her left arm is almost 1/2" shorter than her right.

So . . . I moved her left brake/shift lever up on the bars (these are drop bars) 1/2" and that simple adjustment totally fixed the problem (for her). YMMV of course, but it's something to consider.

Rick / OCRR