This is all great info, people!
I've got a sick toddler at home while my wife is on a family vacation without us (and it's our anniversary), so my hands are a bit full for a few days. I will definitely give the polishing and charging handle a try. Will order the kit, too. I've got a few lowers I can try it with and see if that helps.
As I recall, I ran mostly CCI Mini-Mags in it, and a bit of Federal 550 round bulk. I think I ran some Stingers, too. I remember trying hotter and hotter stuff hoping it would help. My daughter's 10/22 BX-25 mags hate anything that is HP including CCI, so I've put together a bit of round nose. Maybe I'll try a wide variety starting with CCI SV and Mini Mag round nose, as well, as I apply all of your tips.
I have a few days before I can get to my bench to do some polishing, so keep 'em coming if you have any other thoughts. I appreciate it!