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It is becoming difficult to get hold of 2.85mm filaments in a lot of cases now. Surprising that there isn't a conversion kit available from Ultimaker by now.
Sounds like the machine is cold. Without running a print, try setting the bed temp to 60 degrees and leaving it to warm up for 20min or so then try again.
The feature should be made available again, waiting for everything to cool down only to wait for everything to heat up again is a frustrating waste of time and energy especially in the case of an aborted print.
Unless there is a plugin for automatically scaling available somewhere you are stuck with manually scaling each time. As far as I'm aware Cura only works in mm.
Only because I have done it myself a few times, but have you got PLA running on PETG settings? Looks like could be running too hot and curling where the shallow overhang starts.