I have adjusted the minimum air several times, and it wasn't until I got the IAC settings worked out to solve a high idle that I actually got the IAC counts to drop when turning the minimum air screw in. They were at about 5 with 700 RPM idle. I haven't touched it since.

Yes I am using a NB O2. I put in a new one in March. I can try driving around for a bit with it unplugged and see if it improves.