That is too cold sadly.
See my post here for an idea for a tent setup.
(by the way. to get the prints off easy. they fall off by themselves if you let the plate cool off 5 minutes below 30ish degrees from its 65 heated bed temps)
So to make sure you understand the problem, the bed is heating up fine and when air currents in the room blow over the bed it cools it so much in certain spots that the plastic “warps” upwards and does that.
Literally the part you find hard to get off the plate? it’s doing the opposite and release itself which is why you let the plate cool 5 minutes haha. The air draft is doing it for you (which you don’t want)
The A series is supposed to have issues with tents but in cold regions you need them there is no other way. I’m in canada and it’s -20 outside, inside i try to keep it 22-25ish C…to not cook to death with the family running around. Inside my tent it’s about 28-30ish C…as if it was a hot summer day and I have a vent at the top but NO FAN inside the tent. The only fans are on the printer doing their thing and the air flap open at the top.
I can print perfectly like this no warping. Hope that helps!