I am not sure if it helps but there is idle overspeed spark retard and idle underspeed spark advance tables at least with the 95 tbi computer. My cam is very mild but even with it, the timing was bouncing all over the place like a yo yo with the factory settings and the idle had a little lope/instability. I neutered the tables for advance or retard up until a 50 rpm difference then after that decreased the adjustment range slightly. The idle even with the almost stock ramjet cam smoothed out and the timing is very stable at idle now. Even the definitions list the problem " Idle overspeed/ underspeed corrections .... This is why timing is constantly moving around at idle." Not sure if it will help your problem or not but since your IAC adjustment seem to help. I figured I would mention it. I did not remove all the correction, just toned it down a bit.
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