I've been successfully printing for a while now with my R1+, but have been having issues with my first layer adhesion in some cases due to the Auto-level not actually being accurate. I can auto-level my bed, but when printing a claibration square along the outside of my build platform the first layer deposit is raised and lowered. For my bed, the left side is much closer ~0.2mm while the right side is closer to 0.35-0.4mm. Yes, it was actually printing in the air on the right side at one point. By manually shimming the right side, i got the numbers closer to 0.2 on the left and 0.25-0.3 on the right, but it is still not perfect. Is there something in Marlin that could be affecting this? My understanding was that the Auto-level should be able to take care of this problem. Is there a limitation to the auto-level calibration after a G29 is run? Is a manual bed level even necessary? If pictures help i can print something and show.