I have mine set to startup % = 100%, fan min 0%, fan max 100%, on above 50%, damper fully open 50%. I never get overshoot either, in fact my graph looks like Dan's. The PID throttles way back before the setpoint so the temperature actually drops a bit then goes up a bit and repeats until I'm right on temps. Then of course I load it up with meats and it usually overshoots a couple of degrees when recovering from that, but being 228F for 15 minutes of a 14 hour cook isn't too bad in my book.
I pile up all the lump charcoal (3-4lbs?) in the bottom. Use a propane blowtorch and give 3 points 20 seconds of blowtorch and we're good to go. It takes roughly 20 minutes to get to 225F. If you're getting a lot of overshoot, make sure you're getting a good seal when the HeaterMeter is at 0% output. If not running a damper, the star vent at the top needs to just barely be open, so that you can just fit a toothpick into the largest gap. If you're still experiencing overshoot, you can decrease the startup fan % or increase the "D" pid parameter to have it start cutting back earlier.