What works for me is wheat. I
m live a little south of you I think with an east texas sandy acidic soil due to the pine. I also ranch in west texas where things are definitely different. I would go with wheat. I would sew it in early September to mid October. You might even try in late August if you plan on bowhunting off of it come Sept. Pretty much it depends on moisture and heat. If you get a good late August rain and it looks like weather is cooling off I would plant it then.. If no rain then I would wait until cool weather comes in Sept to Oct.
The reason I choose wheat during a cool weather season is because of the physiology of wheat. It must vernalize to reproduce the next year. Vernalization is freezing, this is why you normally see wheat grown in cooler climates like Kansas and Nebraska. Northern parts of Texas are fine and I would say from about College Station north are good planting areas where as in the southern part of the state no wheat is grown because of this warmer winter temperature. Some folks mix wheat with oats and as soon as it turns cold the oats die due to freezing. Im an agronomist and can answer just about any question you have. Feel free to email me if you need help or my answer is unclear.