So been working on getting my bed flat and after tweaking legs and tapping the arms the rails ride on, resuqaring and then noting the bed was bent itself, I have finally got my mesh to .147mm variance. However that was with the bed cold (25c), afgter heating the bed during the PID tuning I remeasured the mesh and with a hot bed (50c) I'm looking at a .407mm bed variance. Is this much of a difference to be expected shoudl i spend more time trying to tune with a hot/warm bed?