Okay so I think I've got a bead on it...

Wash and dry the PEI thoroughly, then get after it with ispropyl alcohol for a thorough wipe down to remove any remaining soap residue.
Apply purple glue stick to the build plate surface.
Default slicer settings for the Aquila X3 Max PETG profile in VoxelMaker.

It would seem once it gets past the first few bottom layers it will either stick and give me a successful print, or shoot off of the build plate like a slapstick comedian slipping on a banana peel. Not a whole lot of in between with this stuff.

With all of that being said, I have a successful print of the Raspberry Pi 5 Pimoroni NVME base case printed in transparent red PETG now.

Now if only Amazon would actually deliver my order my other colors of PETG are overdue...