ECM/FICM Roll Back and FICM tunes

[IdahoF350]

Ok, so first post here and I'm going to let it fly!

I have a 2005 CCLB 4x4 6.0 6-speed truck. It was originally an XUX2 (I can get the original strategy, just don't have it with me) and is now a DPF5 (VXCF7xx). FICM has been programmed to match the later strategy as well.

I want to roll the ECM and FICM back to the original strategy. I'd like to maybe do a mild FICM program to further bolster the fuel economy, especially if what I'm getting about Bills FICM tunes is correct in that they increase the pulse width without so much advancing the start of injection.

I became an SCT dealer back in 2004 and started tuning diesels in 2007. I have several amazingly good programs from the old strategy that would get high-17s to low-19mpg average regularly. The truck averages high-13s to mid-14s now.

This truck is used to tow a 5th wheel. Our last big trip, the truck and trailer combo loaded with the family crossed the scale at 21k combined. It got a best of 11mpg and a worst of 9.5mpg, and averaged 10.25mpg for 6000 miles of SoCal to ND, SD, MT, WY, UT, ID, WA, OR, and NV. Power was never an issue with the manual trans, I just kept the rpm above 1800 at all times, occasionally holding 3rd at 2500 to hold a grade at 50.

What is the best "mild" approach here? My old XUX2_Heavy_Tow_Brake tune made 100ft/lbs over stock at 1700rpm, ran 1100-1200egt's, and got 12mpg. I was never able to translate that tune to the current strategy, and would love to do so. It wouldn't hurt my feelings to have another 50-70 torque in that range.

Thanks in advance.