1. Yes, the max idle throttle % will hard limit how far open the throttle will ever go. The problem is that I think there's another setting that we don't have access to. The trick is to reduce the ECM's expected maximum throttle area, so it thinks it needs to open the throttle more for a given calculated airflow. Then you can actually command more air and get the throttle to open further. I'd start at 10gm/S for the idles cells and work from there. You may get down to 8 or need to go up to 13, depending on the rest of the setup. Generally though, you start a little high, get the idle settled and work down.
  2. The Harrop Hurricane! I'd love to have one of those, best looking intake I've seen and I'd probably prefer one over a blower.... maybe.... I think it'll come down to the response of the engine to throttle changes, as you've said, it's very responsive. If you want to send me some idle logs and a matching tune, I'll have a look. You can PM me for details.