Hi Mike,
I went for the spherical ends. Better for the track. The big 15 in road tryes I run at 15 to 18 lbs so that softens the ride on the road.
The 12 shock adjustments will be handy for easy adjustment. Probably need to re arrange the bump stops.
I got a bum steer with the old spring rates, they were more like 250 - 300 than the 900 advised.
The tech people at QA1 were very helpful.
Snaken