Well.... what a revelation! multiple AB lines in the same field!

I don't know what the heck I was thinking, I was trying to do everything in one operation.  I am alot happier with the unit today.

Today in one field I did my west end headland with A-B

I did my first pass with A+ (90deg) went east,

did my east end headland with freeform, as it was along a coulee.

Came back... selected my previous A+ line and sprayed out the field.

In other words it did exactly what I wanted!

Thanks for the advice!