Very simple. Since the does are what they're after, hunt the feeding areas that does use most often. And remain on the stand for as long as possible, even all day if you can. Funnels and pinch points are another got spot since a doe with a buck in tow might come through at any time.
Also, IMO you have to be careful when using calls in East Texas since mature bucks will often scent check a call first before coming in. If you choose a setup with plenty of cover on your downwind side, you may get detected before ever getting a glimpse of him.