Cold Weather Choke

[ACK]

I have a 250 with a Rochester B and manual choke. It was running great all summer, but now that it's below 30 degrees in the morning, she needs the choke to warm up. When she's warmed up, I leave the choke pulled out about 1/2" or the idle drops really low and she'll buck a bit when moving from a dead stop. The further I drive the better she responds, so I'll decrease the choke as the engine improves, but the choke is never fully off by the time I get to work, which is an 18 mile drive. When I arrive at work, the choke is out about 1/4".

I've raised the idle a tad and adjusted the fuel mixture for max vacuum. Is this just part of my trucks personality or is there something else I should be looking at and adjusting?