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 (phones, iPads, etc.) these days. I come up with a mix that sounds fantastic in stereo, but when I turn on the mono button something will be too loud, or not loud enough.
Hey BA,
Yea...panning drums and bass may seem counter-intuitive, but just a tad helps keep that vocal clean. Give it a try and see if you can tell the difference. I used to keep 'em right in the middle too; I think most people do.
We go to a lot of trouble and expense to produce great recordings and some people, not nearly all fortunately, crush it down to nothing and play it on crappy gear. It's a shame. But those are NOT the folks I write and record for. I know people who don't even listen to lyrics; for them it's all abut the BEAT. Whatever.

If you try some of this let me know if you think it helps your final product.
Thanks for your response. Really like your work.
Bob