I'm no expert on VVT tuning, but I would think you'd want to optimize the phaser table first before making VE adjustments. At least in the part throttle areas where it's on the rich side.

 

The -8% is nothing, I see stock trucks do that all the time.

I bet if you just hand smoothed part of the VVE and MAF curve in those specific area's it would come closer to zero.

 

Updates?

 

Been pretty busy lately. I've put on 1600 highway miles with the new cam with towing included for about 800 of those miles. I'm running MAF only until I get the wideband unwired from the other truck and installed in the Tahoe. I tuned the MAF using LTFTs and am running almost 0 LTFTs. Gas mileage seems to be 1mpg better on the highway. I also have zero knock now. Before I was having a lot of knock even after desensitizing the knock sensors a little bit. I attribute this improvement to the decarbonization I was able to do to the pistons when I had the heads off. There was TONS of carbon on the heads and pistons that I cleaned up carefully. I don't seem to notice any power improvements but am happy with the way it turned out. I didn't install a cam phase limiter.

 

Without optimizing the VVT tables, you probably wouldn't notice an appreciable difference. Looking at the low/med/high baro tables under the Variable Camshaft section of Airflow, I'd probably subtract 2 degrees cam retard for any values > 0.