Absolutely fixed it. Thanks!

I've never be able to get a printer to successfully pause and resume a print, so I believe it to be black magic and impossible.

Absolutely is. I've edited the .g files already with your adjustments. But I'm about 6 hours into a twelve hour print so I'm going to let it finish before I e-stop the printer, reboot, and try the new settings on one of my 4 hour files!

Then it's back to printing my 48+ hr prints haha! Hopefully this'll shave a few hours off so it's not waiting for retractions to finish constantly.

I'll give that a try tonight and report back when my current print finishes. I think this is likely the issue.

Very odd, I've had a few anomalous values come from the reprap's online tool. It's odd it doesn't do your pro-tip either.

I've had to do a lot of manual doctoring to this file to get it to work. But that's another topic.

... Odd though, it's set to 837 in RepRap's online tool. I wonder if it multiplied it by 128. x16 microstepping with 837 should work.

So M92 X80.00 Y80.00 Z400.00 E837

on M350 X16 Y16 Z16 E16 I1 ?

It's a Titan Aero extruder, that's the correct ESteps. Measured and it's accurate down to the sixteenth of a mm.

I'm unsure why, but my extruder is stuck at max speed 1.33mm/s on the website console. The config.g file is set to a much higher speed.

Am I missing something obvious?

config.g file: https://hastebin.com/ohanafotum.sql
config-override.g file: https://hastebin.com/yewalojaqu.css