I usually have it at cruising height and turn the suspension off after it lowers to curb height so it is not working up and down at the track.
You can tweak the rear height with the ASHAM8 but it is not 'user friendly'. You have to lift the module out and adjust a rotary pot on the bottom of the unit. From lookin at the pics, I might need to measure the suspension height and see if the rear is a smidge high.
The Module VIII has an adjustment to tweak the front to rear height also. It seems to be a bit nonlinear depending on the height. This may just be the nature of the beast.
I adjust mine at the height that I normally use most often, about an inch and a half lower.