I hope you are not still thinking that the numbers listed for KTWL are for the parent station's "Texas Mix" format. KTWL cannot be heard over the overwhelming majority of the Houston market as it is wiped out by the 105.3 translator that runs the "Power" format. In fact I would be surprised if there are any PPM panelists in the areas where KTWL can actually be heard clearly.
In northwest Harris County, you have to drive past either Waller on 290 or Pinehurst on 249 before you can get KTWL clearly, and those are exurban, thinly populated areas.