Rich --
I'd take it back to the tuner and have him try to duplicate your issue.
My 427 small block runs an Imagine Injection 8 stack --- and at that cruise speed I'm running 13.8 A/F. The 8 stack seems to need a bit richer A/F - or so it seems.
The VE you adjusted is the most important function -- once that is "set" correctly -- then you can play with A/F and the ECU will just make that A/F happen.
You didn't mention your TIMING -- and you could be seeing a timing issue right there? Too much advance might give you a hiccup. The new heads etc tend to take LESS timing than in the old days. But you're description was to paraphrase - light load - cruise... so I'm only mentioning timing because you didn't give a number for that area.
Now -- I've increased my thermostat to a 195 degree, up from a 180 -- and have the fans on a Spal PWM (pulse width modulated) controller... and I'm cruising around 200 degrees. I like more heat - because with the forged pistons -- I want a bit more sealing (expansion). I'm running Amsoil 15/40 Synthetic.
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