Fall tomatoes in Texas

[hornstrider]

I live in Hutto, Texas just northeast of Austin. I just completed my spring tomato season, and I am getting ready for my fall garden. I had my most productive spring tomato season in 5 years. Last fall I planted approx 10 tomato plants w/ very limited success. I am starting my seeds today(Cherokee Purple, Big Beef, and Sun Gold). My plants should be ready to put into the ground Aug. 10. Can someone give me a few tips about how to grow successful fall tomato's in Texas. The daytime temps in Aug. range from 98 to 105, and continue through Sept. Is a shade cloth a reasonable solution? If so what % shade cloth? Any suggestions would be appreciate. Thank you.