Successfully configured with stepconf: but +Y-axis "stutters" running G-code

Andy, the fact that you got snake-bit by the editor has affected me more deeply than your guidance and directions. Finally, something I _share_ with you. ;^)

Nebur, I've done the 2.7 install from .iso to usb stick. (yes, yes, I know, but am I right that the numbers indicate it might actually be performing decently?)  Note that I still had to boost the base, --base 25250, because at 25000 ns, the servo side showed some overflows on the left-hand side.

I have to wonder, since I never remembered to try that with the original setup, if setting the base to 30000 might have stabilized things. I know Tommy suggested it, but I was in a stream of suggestions and before I knew it I was being carried downstream on a different tack.

That looks good so far, so it is about time you fire up the machine and make something move!

Tommy, I can't simply leave well enough alone. I at least must go back and try the LinuxCNC 2.8 in Debian 10 .iso install again to see if perhaps I overlooked setting up a swap in it as well.

[Spoiler: I actually did that between starting this post and finishing it. Quick answer is "Yes, LCNC 2.8 seems to be performing acceptably in Deb 10 buster now too."]

Details tomorrow. It's 3:44 am; I had to stay up for an airport run.