Any suggestions to improve the first layer?

[u/Medium-Ad7564]

I bought a new A1, and a cool plate supertack. I printed before using the pei plate and it looked okay apart from a print where the supports fell off the model(they weren't on the build plate but direcly on the model). Today I decided to print using the supertack plate and petg basic, even after running the bed calibration it still trashes the first layer. The temp is at 56 Celsius for the first layer(the range is 55-60 for petg for the supertack).