I don't have your vehicle, but do own a 2001 Ford Mustang 3.8L V6. I use Sniper and Commando to tune so I have Open Loop Fuel Tables.
Can't say if my tables have any correlation to your issue; I will say though the figures are interesting. Black type are preset tune values from Delta Force and blue are stock. Even so with "leaner" values from Delta Force, you'll see they are pretty darn rich at moderate throttle. That's not to mention that practically 99% of gas you put into your vehicle is 90% gas and 10% ethanol (E10); making these numbers even more far from your target.
So if you notice at a certain throttle position at lower RPM 700 - 2500 there is a huge change in the air to fuel ratio. It becomes very rich. This may be what you are experiencing. Not owning your car, I couldn't guarantee that. The only consolation is that we both have Fords from 2001. Maybe that's something implemented for a "Safety" buffer preventing super lean mixtures that would cause problems/damage.
In any case; I have adjusted my high and low slope injector values to "tone" down the rate at which they expel fuel. multiplying the value by .94 will give you an approximate conversation to work with e10 gas (used everywhere). The tunes provided by delta force do not account for that in my tune.
Read this forum post that talks about e10. There is some insightful info about wideband tuning AND e10 gashttp://www.svtperformance.com/forums/sh ... 757031-e10