Time to rebuild?

Cold choke should be called out in the rebuild kit, or one of SSD's links. Usually its called out using a feeler guage against the choke valve and side of venturi. When warm, the choke should be fully vertical. I must repeat that the valve lash needs to be adjusted as this effects many factors such as vacuum readings. And of course check your exhaust heat valve for freedom of movement. It should bounce against the spring when cold. Have you sprayed down your carb throat with carb cleaner during a fast idle? I had some air bleeds that were clogged and that messed up my off choke warm idle.