[JimH]

Don't know the first thing about power corners.

I think I figured out what was distracting me, would almost appear as the background light was acting like the light source as there is a natural angle that draws me up past the subject and into the light. Mirroring it simply takes that away and allows more room to lead the eye into the subject. If there is a comparison between leading lines/angles and power corners - maybe that's it.