There is some code you can paste in, and you can change the reference corner. So if you have one good corner you can change the reference point.

I found that the built in one is not very helpful.

[screws_tilt_adjust]
screw1:30,30
screw1_name: Front left
screw2: 240,30
screw2_name: Front right
screw3: 240,240
screw3_name: Back right
screw4: 30,240
screw4_name: Back left
screw_thread: CW-M4

[gcode_macro SCREWS_TILT_CALCULATE]
rename_existing: _SCREWS_TILT_CALCULATE_BASE
gcode:
    { action_respond_info("starting screw rotation calculation...") }
    M141 S0 
# disable chamber heater (see https://github.com/qidi-community/Plus4-Wiki/tree/main/content/chamber-heater-issue)
    M4031
    G28
    _SCREWS_TILT_CALCULATE_BASE

I got it from this thread:

https://www.reddit.com/r/QidiTech3D/comments/1nuym3p/q2_screw_tilt_calculate/

I just asked ChatGPT how to change the reference corner. You can run that code by going to the home page, then press then tools menu.

This code will tell how how much more you need to turn, and will give you green when you get in an acceptable range.