Cheers Trakyan - that make sense.
got no issues with the hotend heating up, that's quick.

It's the bed that's the issue. given that on 50c it usually runs 5-9c hot and on 90c about the same cold. Can't see swing being that much of an issue.

lol that's not what I would call automatic bed levilling.
For it to be automatic you click one button labelled 'autolevel' and it does all that crap by itself.
Anything else just shouldn't be called 'Auto' :-)