Finally got around to setting my CO
 

So since I'm fairly far from shops that can test CO I'd set my mixture via the "setting CO without gauges" threads and was just this side of rich surge when I was able to get to a CO machine. Turns out it was 6.5% rich. I adjusted it back to 2% and it feels much crisper.

Hopefully setting A/F ratio at 6400ft won't change things too much at 8500ft where I do most driving.