Finally bought Simplify 3D but I can't seem to find a profile that works.

@Aric_Norine I see that, but it’s the only thing that doesn’t cause my printer to attempt to move the print head outside of the build area.

Simplify3D support helped fix the problem. My new start gcode is below.
G28 X0 Y0 Z0
G92 E0
G29
G1 X0 Y0 Z0.5

Great news. Did they give an explanation?

Nope