KludgeGuru - thanks for the tips about the start g-code. I am at work so I can't check but just wondering: does this code just update the start wiping procedure while keeping most of the original "good" code from Simplify3D?

I am completely 100% new to G-Code but I think your left extruder g-code has a small error.

M135 T0 ; Load right extruder offsets
should be
M135 T1 ; Load left extruder offsets
Also, can anyone confirm that our build platform for the QIDI is 230 x 150 x 150? I believe the default S3D Flashforge Creator Pro profile lists it at something like 230 x 145 (or 148) x 150 .. so a shorter Y axis. I've also seen people post screenshots of their settings where the Y and Z numbers were even different from that.

Also, what is the 0,0 position of the machine? is it dead center? Or is it in one of the corners?

Lastly, if you install a glass plate and put a shim in, do you need to adjust your build platform settings? I mean it's really not 150 cm in the Z-Axis anymore right? It's more like 143 or something for a 1/4" thick plate.