You can fine tune your G31 Z value to get a good first layer. During a test print, watch the first layer go down and adjust the Z position using the baby stepping function.

If you have to move the nozzle closer to the bed, increase the G31 Z value by the amount of baby stepping used.

If you have to move the nozzle farther away from the bed, decrease the G31 Z value by the amount of baby stepping used.

left click on config.g file in system folder to open.