Not sure you have the kickdown adjusted right. This video touches on it. At around 8:47 discusses adjusting 1 pc linkage

https://www.youtube.com/watch?v=FY9WTWayCC8

What have you done to adjust idle? You can disconnect the kickdown rod away from the throttle and adjust there. This will eliminate any chance of the rod influencing the idle. Just put on the throttle return spring. Idle issue is not with the kickdown rod. I don't know if you get the carb linkage stuck on high idle cam on the other side or something binding. You should be able to get it down to 900. Doesn't look like the idle solenoid is touching the adjust screw, so that is not the issue either. How do you "manually" get it down to 1100? Then of course, what tach are you using. My stock one reads a bit high, I use a digital one on my timing light for better reading.