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75 degrees = 68 degrees. No wonder I couldn't get things to adhere well sometimes.
As a side note, the temp varies wildly along the plate base. An enclosure would definitely help here.
Has anyone else tested the actual temps versus the set/displayed temps and noticed a difference?
Adhesion I'd totally recommend cleaning your surface with soap and water (surface depending) and then messing with temps. With abs and petg I've found that even a bit of finger print residue is enough to cause a part to come away from the bed, next I'd check first level height. I've very rarely found the bed temp to be the reason I lost adhesion.
I use PETG on a PEI sheet like OP has. It will stick so hard that it rips the PEI off of the metal plate if I don’t put some hairspray down as layer in between.