Just switched back to PLA to try out the picture frame, I have the bed set to 60 degrees and it works good. I was temporarily using PETG to print some upgrades, the petfang hot end cooler and belt tensioners.
FYI the MG CHEMICALS natural PETG is amazing. Very strong and it prints at a lower temp than other PETG manufacturers. I was printing the PETG at 220 degrees and it was perfect. Also be careful, the ender 3x I got seems to be a little different than the older ones. The petsfang duct I printed had some minor differences. It seems my blower fan is a bit of a different shape ? And also the stock hot end wires are very stiff and Interfere a little.