Part of the reason the storms struggled yesterday in DFW proper is because, aside from the somewhat erractic vertical shear profile causing the storms to easily split as well as somewhat unimpressive mid-level lapse rates, the activity that did pop off along the dry line quickly became outflow dominant due to low-level lapse rates not having a sufficient opportunity to steepen.
Today seems to be playing out similarly (for N. TX that is), but even when the low clouds do finally erode, it will then be a race against time with the high clouds from the TX panhandle blowing in (also working to limit heating).