Anybody know a top notch front end shop in Dallas area?

[ssi9620]

'05 F350 Crew Cab, 4WD, 6.0L. Stock tire size w/mud treads, stock steering gear box, steering stabilizer, wheels. Rancho shocks.

The steering on this truck feels "tight." It won't find center...i.e. if you change lanes you have to correct the truck back to straight but, since it's so tight, you end up in a correction/re-correction situation that has you wobbling down the road. It's been to 2 Ford houses, an off road shop, an alignment shop and a diesel specialist. We've replaced the steering gear box 3 times, shocks twice (Rancho to stock and stock back to Rancho), 3 sets of tires, two steering stabilizers (stock to Rancho dual shock and then back to stock single shock) and a power steering pump. We've also played with air pressure and shock settings. Some things will make it a little better, but it's borderline dangerous to drive. Alignment is good.
The only things that haven't been replaced under there are the ball joints, tie-rod/drag link ends, so I guess that's the next step. Every place it's been they've sworn that those are fine, but nothing else seems to be working.
I'd like to find a good, reputable shop that has a lot of experience with figuring out stuff that nobody else seems to be able to. If anyone knows of such a shop in the Dallas, Fort Worth, Denton, Sherman area, please let me know. Of course, if anyone else had this problem and can suggest something, I'd be grateful.

Thanks.