VC4 IDEX 500 Bed Temp and Mesh variation

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?
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