OK, again, still playing with it all.
What are the 'pwm frequency' and 'max steps to extend' values? I have done plenty of motor control before (although not with anything as involved as an ICE is, I have also done some PID control before as well, so I get what I am trying to do, vems is just still new to me) and generally a higher pwm frequency is 'better' assuming your controller support the resolution needed at that speed. But really, so long as your frequency is fast enough to make the coil have an averaging effect to the voltage and isn't reacting to individual pulses you are good.
However, when I play with these numbers I can change what is going on and it is somewhat confusing as the frequency, so long as it is fast enough, shouldn't be screwing with how the idle performs...
Jim