well you can't dry filament out too much.
But what is the humidity in your flat ?

people who like hot rooms often have them quite humid as well. (both can come from lack of air flow)

and at the end of the day it's a creality ender - so, yeah lots of problem are expected.
But this definitely seems to be your living environment :-)

Try leaving the filament in the fridge overnight, NOT in a bag and see if that makes a difference.