Here’s whats weird :
1)Your extruder steps per mm should be around 417.5 to extruder the correct amount of filament – yours is twice that. (I still havent seen the photo from under YOUR extruder stepper drivers – just the snip of the manual you posted.
2)When you go to print, magically the print by the sounds of it trys to extrude more – sounds like someone has compensated in their slicer profile and not set it back to 1.0
Here’s what I need. PLEASE do this. :
Preheat your hotend :
Remove the bowden tube from hotend
Use the LCD to extrude 100mm and PLEASE tell me what it measures (exactly).
Also – should have checked before, but can you please verify all GT2 pulleys connected to the motor shafts are not slipping? If so tighten grub screws.
This problem i have no doubt is ridiculously simple – the trouble is Im not there to see whats going on so its really important that you answer all questions and with things like failed prints, please post a picture -doing so will really help me to help you.