Be sure your bed is clean -- a dunk under the kitchen sink with Dawn is recommended to ensure even grip before applying Windex -- and that your Live-Z is properly adjusted.

If you find corners or ends warping, you can try printing with a brim, or create "mouse ears" with 0.2mm-thick circles or squares in the corners.

Hotend: 240°C

Heat Bed: 90°

I've always used blue painters tape for bed adhesion with the addition of a layer of glue stick when needed which seemed to work alright for the test.

But now I'm on my first large print that just fits diagonally across the bed, has a tendency for the corners to warp and lift heavily. The glue prevents it from lifting off of the painters tape but instead it is simply ripping the tape off of the bed with it, ruining the print. 

So I need advice on how to proceed on this. Do I ditch the tape entirely? Or is the high bed temp weakening the adhesive of the tape and I need to lower bed heat? Any input is greatly appreciated.