I was just coming back in to post that after giving myself some sulking time, , I went back and found the problem very quickly. I use twist lock plugs and the one I installed for this project is temporary. It appears as though it will be *very* temporary.... It is especially hard to get in all the way and apparently it wasn't fully seated. I found it very quickly when I measured my voltage on the inputs and they were *clearly* not all connected. So, this was a simple brownout situation. Now all the amps are working properly and I can home the machine properly.

Haven't tried the spindle yet... I don't know the Meldas control (or G-code for a mill, actually), so I need to figure that out. Should work though. Tool was stuck in the spindle but I got that out. The previous owner had left one in there for about a year.