Raft bond too strong

[EagleSeven]

So I have a glass plate on the bed now and I increased bed temperature to 65 to account for the heat loss through the glass (printing with PLA). Have not had a successful print yet. There seems to be some curling of the print and at some point the nozzle catches on a curled corner and pulls the whole piece off the bed. Is the curling because of excess or insufficient heat? Any other suggestions? It is worth noting that the preheat function on my printer doesn't seem to work. When I go to preheat and select on for the print bed, nothing happens. Is there a trick to doing a preheat?

Overhangs will curl like that, the thinner it is the more it may curl.
I keep a long bladed knife handy to push down those curls.
they usually have a little spring-back, so need to push a little past level.
Those are very Soft so don't over do it.

If you are in the correct area of firmware, when trying to activate preheat, and still not work,
then there must be a problem with Firmware.
Did you reload firmware recently, to maybe cause that ?
Which version of Firmware are you using ?
Did preheat work before and quit, or has it never worked ?