It sounds like the IAC reset fixed the primary problem. I had understood that it would adjust on it's own after some trips, but that appears not to be the case. Good to know.

I do want to point out that on today's vehicles you never want to adjust idle screws without the proper diagnostic/scope tools to do the job, as well as manufacturer specifications. You can end up chasing problems that would not exist if the adjustments to the idle screws had not be made. Back in the day we would do that on carburetor cars, but not any longer. There is possibility that the rich smell you are experiencing is a result of adjusting the screw.

Best thing I can recommend is if at all possible to put it back where it was. Then determine if there are any further issues at that point. The fuel trims would not have been related to the specific problem you were experiencing. Though it may or may not be an additional issue that needs attention. But you will need to find a program for that dongle that will show you O2 sensor data for all the O2's as well as long term and short term data for both banks. I have one of those dongles but don't use it so I'm not certain which program to recommend. I know there is discussion on the forum here. Good luck!