The S-AFC HAS NO POSSIBLE way of keeping any tune that is not WOT. Don't even bother trying. Seriously.

It's time to get to a dyno that has the capability of burning you a custom chip. A Mustang dyno would be preferrable because it can tune more accurately and at any rpm points & throttle positions besides "just " WOT.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.