Actully cyntaxx, from 3300-3700 you are running a little too lean for my taste, But the way the chart looks, that is probably just a stoich mixture from part throttle usage, while the dyno operator is getting the car into readable territory. There is usually just some tip-in lean condition till mixtures even out, so I wouldn't be concerned about that. Is the restart in the rpms from the tranny changing gears?

From 4100-up you are fine, you progressively get richer as the rpms get higher, and thats a safe pattern. 11s on the A/F chart will keep your motor lasting longer. Tell kdanner to stop trying to teach people anything about tunes. And if thats the extent of his knowledge, I would seriously call BS on him ever running 9s in any car!

Good luck.
joe