[XfireZ51]

I am not clear how this very specific circumstance manifests itself in your driving, but the answer to your question is that there is a transition between Closed Throttle SA and SA used for driving operation. That's dictated by the %TPS opening, which in the stock cal is 1.95%. Once that's exceeded, the ECM moves to the SA table. The TPS mechanism is a rheostat, so there are "jumps" in voltage as the contact moves from one coil to the next. It won't be absolutely linear.
As I said, I flatten my SA table in the area circled red in the attached .jpg. Or I keep it very close to smooth out the transition. Attached is a pic of what I am describing. This is from a stock calibration. Its almost exactly what you see in your DM log.
As for setting the IAC count for Minimum Air, the procedure I follow is:
(Do this procedure once you have warmed motor to C/L operating temps. otherwise it may very well not idle. Also, you will have converted your throttle stop stud to a hex bolt)

1. Jumper the ALDL as you would for reading codes.
2. Turn ignition to ON, not start.
3. Leaving ignition ON, remove the IAC harness connector. This fully extends the IAC pintle and closes off the IAC port.
4. Shut ignition OFF and remove the ALDL jumper.
5. Start the motor and get it to idle. May need to use a bit of throttle at first.
6. Check idle rpm. Turn the throttle stop screw until the motor is idling at an rpm just below what your target idle rpm. I want my idle at 875-900, so I set Min Air throttle at 800-825rpm. You may need to adjust TPS Voltage so that ECM stays within idle TPS Voltage range.
7.Tighten everything up and shutoff motor.
8. Plug in IAC. I also undo the negative BATT cable to drain the ECM memory.
9. Reconnect BATT turn ignition ON, and check TPS V. Adjust to .53-.57v if necessary.
10. Start motor and quickly raise to ~2000rpm for a brief period. This resets the IAC.
11. Shutoff motor, then restart. Allow motor to idle down and check your IAC counts and your TPS Volt which may need to be adjusted one more time.