Edelbrock Electric Choke Issues?

[savatreatabvr]

Just installed a Edelbrock 1407 on my mid 70's 454 and it runs great! My only issue is when I hooked up a switched 12v wire to the choke it didn't really do anything but if I slowly close the choke flap with the engine fully warmed up it raises the idle and seems to run better and when I flip the choke flap fully open, (vertical), it idles lower and runs rougher! It's like it runs better when the choke is on or partially on! When I manually close the choke flap when fully warmed up shouldn't it automatically open back up with 12v applied to the choke?