Geeetech

Update 2: Important Found a bug in the e-factor for the extruders feed rate, causing the second extruter to perform incorrectly in some circumstances (thanks to the user szerwi). Firmware file updated, please download the latest version and re-flash.

In my case, the adhesion of the "Super plate" was not so "superb" as well, exactly as in your case. I use Aquanet hairspray on all my build plates, so I tried one with this machine too. It helped me a lot. Try to make a very thin layer of Aquanet on your build plate, let it dry and see if things ...

My Start and End G-codes in Cura working well with this firmware:

;Start G-Code
G21 ;metric values
G90 ;absolute positioning
M107 ;start with the fan off
G28 ;move X/Y/Z to min endstops (Homing)
G29 ;start auto level
G1 Z15.0 F9000 ;move the platform down 15mm
G92 E0 ;zero the extruded length
G0 ...

This is Marlin 1.1.9 Firmware for Geeetech A10M printers with mixing extruder. I ported all Geeetech features from Geeetech's 1.1.8 version, which include:

Full BLTouch support with my hack allowing to fine tune small build plate tilts which could not be eliminated by autolevel alone; BLTouch is ...

Have you added "G29" (Start auto level) command to your "Start G-code" section in the machine settings in your slicing software? This supposed to be the next line after "G28" (Home).