I'm flying the iFDG A320 with Ken Mitchell's excellent panel. I'm unable to maintain any kind of predictable response with the autothrottle. I take off and after reaching about 4,000 feet, I engage the master autothrottle button and the speed hold button. If I ascend at 1,800 fpm it stalls. If I ascend at 700 fpm, it speeds beyond the set speed. Anyone else experience this?

Sorry to say that I have not tried Ken's panel. I use the PSS panel. In the event that they are similar, be sure that you retard back to the climb setting from TOGA after takeoff. If you don't, autothrust/autothrottle has no effect.Good luck:RTH