I can agree with a lot of what your saying. In my case I data log on the street but can't (won't) go WOT in 3rd to redline anywhere but the track or dyno. I do some WOT pulls in 2nd. Then I hit the dyno to confirm and see what's happening in 3rd. My AFR's are perfect in first and second gear. The recent problem is only at the top of third. Perhaps at the top of 4th as well but I rarely pass 140. I agree that before getting a tune you should have a wideband. I did! I'm a dyno tune guy from experience. After having a few canned tunes that IMO were way off I got a dyno tune that I think was perfect. So, from the graph do you think I'm out of fuel pressure or near the duty cycle limits or something else?

Les