so you're making proper end usage parts, 80 at a go !
I am impressed :-)

The pei 'stick when hot but not when cold' does work well.
Pretty sure printbite is a type of pei. The sheet on my delta has been going for nearly 3 years.
I do find you need to up the bed temp a little. So my standard pla bed temp is 65c - and I get no issues at that. The normal 50c for pla, doesn't work as well.
It's interesting that the pei does better than the magigoo (I did 'acquire' a half litre bottle of some kind of print glue at tct, so I'm set for life lol)
I found that fresh magigoo will stick even the most detailed prints.
Mind you I'm printing in a cold garage with about 50% humidity, so ambient conditions could make all the difference. You're somewhere tropical, right ?