1) I'll try that. It's been a few years and I didn't install it myself but I seem to remember that I had to order a throttle extension lever. The manual does indeed mention HLY 20-14 or -7, depending on the application (passenger car/truck). Again: I'll check that.

2) It does have a calibration screen and I tried that. Didn't do much though. Updated my throttle angle to 45-215 (closed/WOT) but it didn't seem to do the trick. I think you can't recalibrate for an out of spec throttle position (if that makes any sense).