Seems odd that you would pan drums and bass. I always keep these right in the center, especially drums which is a stereo file (as rendered from BIAB). Although I suppose 5% is pretty much the same as zero.

These days what I struggle with the most is making a mix that sounds good in both stereo and mono, because most people seem to listen on mono devices with crappy speakers these days (phones, iPads, etc.) . I come up with a mix that sounds good in stereo, but when I turn on the mono button something will be too loud, or not loud enough.