Re-reading your initial post: Do I understand correctly that you recently got a new heated bed? If so, I’d contact Snapmaker support and ask for a replacement on warranty - as far as I understand you did not have similar issues with the old bed? I just realized that my old kickstarter print bed (not the frame, the actual heated bed, i.e. the PCB-style thing where it says “do not print on this”) is lumpy - the frame had its own lumpiness, but the bed itself is also far from even, and in places where I cannot do anything by tightening or loosening of screws - it’s areas where there are no screws… That’s the reason why my hopes I had for the new frame seem not to be fully fulfilled: The long-awaited quick swap kit for Snapmaker 2.0 250/350 machines - Snapmaker 2.0 - Snapmaker: where creation happens - still, I yet have to print the test pattern to verify how good/bad it is.