Jay, do you have the SJ aluminum caster block? Were you able to get it to work for 9 degrees in the narrow configuration? I noticed the upper arm (rear mounting point) is fixed....
Tried to put on an SP-1 aluminum block but it was no bueno.
I have have the alum block but I have been running it at 7, I have not tried 9 yet.
On the SP the arms just flexed at the knuckle for the 10, made the V collapse some, didn't have any issues , but I always felt 10 was too much. Sacrificed too much entry for exit and the only other option was 5
I'm still working on dialing in spring/oil right now. I just built a set of the bladder shocks and got the spring kit. I was going to move to caster next, I noticed the setups on petit all ran 5 or 7 so I started at 7