What'd you find?

As for your first question, the answer depends on whether you're achieving your cycling goals. If so, no, there isn't much you should do -- if you weren't previously aware of such an asymmetry (and you've verified it), it wasn't affecting your cycling goals.

The noted cycling coach Alex Simmons has been using a power meter for years, and competed at a very high level both in road and track racing. Then, several years ago, he had an unfortunate accident that eventuated the amputation of his left leg above his knee. He has a pretty severe bilateral asymmetry, and also power data from both before and after the incident. There isn't much he can do about his asymmetry so he just focused on training his total power. It took him couple of years of serious rehab but ultimately he was able to surpass his pre-incident FTP.