I have a family member in DFW who has really embraced Uber, and wait times for the area are minimal, and they are around 20 miles from the Downtown area of Dallas (very mid-cities). I never thought that Uber would catch in DFW, and I'm really surprised to see how it's changed life for a few people I know there.
Maybe it's been some time since you've tried Uber there, but I'd recommend trying it again. Also my family members there now swear by it for trips to either the DFW or Love Field airport.