I had the same issue with my stoker. I had to damper down the top vents quite a bit or the temps would swing ALOT. With the egg I've heard of people either getting up to temp and then turn on the draft controller or setting the temp low and let it overshoot up to your set point. I usually close the exhaust on the egg most of the way and set the temp for 200. It will overshoot to around 230-250. I change my set point to 250 and away we go. The stoker has a 10 cfm fan and I think it's way too big. The partyq is much smaller and creeps up on the set point very slowly. I can set it for 250 and let it do its thing.
Large BGE, Mini BGE, UDS, Weber OTP, Party Q and Stoker... So Far...