I managed to get the back corners within 0.021 of each other. However, when heating the bed, it warps. The warp is most noticeable in a line down the middle from front to back.
Biggest variance is in the back with the corners being lower than the center.
Leaving the bed heated for 10 minutes before probing in an attempt to get a more even temp throughout the bed makes no difference.
Bed is 500mm vcore 3. Pic is a shot from the back.
Any advice welcomed.