One other thing that I found to be effective with my DA this weekend was that I was having a problem getting it to start and it was quiting just about every time I would taxi in on low idle from a flight.
Cure was I changed the spark plug. Take the pulg out and if it is covered pretty good with carbon change it out and you will see an instant improvement in starting and engine performance.
One other thing is that my DA likes to be primed before I start for the first time evey day.
Steps:
1: Ignition off wide open throttle flip prop 4 to 5 times and its like you can hear it draw fuel
2: Ignition on high idle on choke on flip prop until she pops
3: turn choke off usually 5 flips and she is running on high idle

Also with the very hot weather that we had her it seemed that the motor liked to be riched up just a bit on the low end. Found this when testing the transition and my motor stumbled.

I use this procedure once motor is running and warmed up. Clear it out. Return to idle let motor idle low idle for 30 seconds. Transition briskly to full throttle and if motor stumbles it is to lean. If it bogs it is to rich. (All on the low end).
Set the high end needle by a tach and by making tempeture readings after flying.
Sounds a little crude but it has seemed to work out for me.