Is the pei build plate in need of rejuvenation by chance?

I’m not a very active printer, but everything I’ve seen about tpu printing on pei sheets suggests that it sticks too well - oftentimes ripping chunks of pei out.

If your sheet is pretty old, iirc you can rejuvenate it by rubbing it with some fine steel wool.

Also, have you tried a raft instead of a brim?