I think the reason that the car has troubles with DFCO is because it is not making enough power to turn the electric motor so he has to add air. To adjust for this it would be easiest to open the throttle at close by adjusting the throttle stop screw to test a hole could be added if needed or wanted in the throttle plate.
I see it as a success if you can keep it charged looking at your fuel log you were getting 31-37 mostly Highway and were getting 24-27 city. If you are now getting 35 in city that is ~28% increase (from 25mpg to 35).
Do you have the controller set up to charge the batteries?
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 I move at the speed of awesome.
"It's not rocket surgery!" -MetroMPG
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