Interesting!
I switched from Printbite to Filaprint as I had way too much trouble getting the first layer to stick. With Filaprint I had a lot less trouble.
Interesting how experiences differ from printer to printer or from user to user.

But loose calibration, yes, that would not surprise me. I am changing my effector every day testing something new. Swapping hot ends, nozzles or even the whole effector. Stress testing an extruder does these things to your printer.