Try setting MIN_THROTTLE_LIMIT = -0.01 and AFTERBURNER_THROTTLE_THRESHOLD = 0.70, thats what seemed to do the trick for me.
Lemme know what happens when you try those numbers.
Using AFTERBURNER_THROTTLE_THRESHOLD = 0.70 works for me. I was using 0.80, when I had a 32 bit OS. I don't understand why I had to make the change when I installed a 64 bit OS, but it works. As far as setting MIN_THROTTLE_LIMIT = -0.01, no joy. I still get high thrust at idle on the Sludge Hornet and the Acceleration Hornet (high enough that I have to ride the brakes). I've experimented by changing the airfile. It looks like I can fix the high idle thrust by changing a couple of numbers in the airfile (that works for me).