I got to the root of the issue with my valve.
I put a pressure test port where the swing valve port plug is. Suddenly, the proportional solenoids began to function with autosteer engaged. When I put the plug back in, no function.
I thought that was really odd, and had to think a bit about what could possibly be the cause. I compared the plug to the test port threads that I installed, and the test port was slightly chamfered compared to the plug. I looked into the plug port and noticed an oil galley in the threads. This must be the LS port to the compensator, correct?
I think the plug was blocking this LS galley to the compensator, and therefore the compensator was unable to shift any flow to the proportional solenoid.
I took the plug to my bench grinder, and ground off a couple of threads worth of material, then tried the valve again. Sure enough, it works now!
By the way, what is the thread of that port? I thought it was M10x1, but that didn’t thread in, and I didn’t want to force it. A G1/8 thread fit nicely. Is that the thread size of that plug?