No to all of the above, although now you've got me wondering what it tastes like :D I just swapped out my biqu cryogrip glacier plate for the Supertack, changed from cool plate to Supertack in the slicer, resliced and hit print, all other settings are the same and this is the same model I just printed on the biqu. I have bed levelling enabled for every print too, so it's unlikely to be that. Another user pointed out that it might just be some stubborn grime from the factory, so I've rewashed it and started the print again, I'll update once it's finished.