I did check that the motors and belts were tight. I locked the motors and pushed down on te carriage and did not find any play. I've tested the bed with and without issuing the G29 command.

I spoke with Dave, FLSun's English speaking support guy, last night. he remoted into my computer and went through the settings himself and we ran several prints at varying speeds and temps. I completed a 195-degree print at 50mm/s this morning that is no better and no worse than previous attempts have been. Where it was previously only on one side, I have noted that it does happen on other sides as well, largely the left and rear, were you facing the printer. Dave, at one point, was shocking his head and saying, "it's just wierd"