This – it fixed the problem for me immediately – I set the initial layer to 225 C as d_tibi indicated and the prints stick and then come off easily, no damage to the plate. No curling, no issues, no fighting – just print, cool, pop! 
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I wanted to add that this worked for me for having a lot of a 1st layer brim stuck on my textured PEI plate. I added cubes in Bamboo Studio and scaled them to appropriate width/length and 1mm height.
I tossed in the freezer 20 minutes and carefully peeled up, and 99% of it came up.
As a side benefit, I now have a mini ruler out of it. 
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I had problems particularly with the brim as well. Classic supports are a problem, too, albeit somewhat less.
I got rid of this by printing a 1mm plate with 100% infill over the stuck filament areas.
Does anyone know how to increase brim thickness beyond one layer? As far as I understand, Bambu Studio offers no setting for this.