Make homemade seitan taste like commercial
I have never cooked with seitan, but found your question very interesting. The below  excerpt from VeganFuel , includes a letter from the President and Founder of Fresh Tofu, Inc, a distributor of Ray's Seitan:


  We asked if their seitan is made in house, as it is consistently the best seitan we’ve had. We thought we may get some secrets for making our own as tasty. To our surprise, they don’t make it. They get it from Fresh Tofu Inc., who distubutes Ray’s brand seitan to a number of restaurants including Candle Cafe and others. If you’re in NYC, you can find Ray’s at Lifethyme on 6th ave. Anyway, I contacted Fresh Tofu and their Pres/Founder Gary was more than willing to give me some tips on making our seitan more kick-ass. He said it’s all about how much starch you rinse out after it is in dough form- this also means using high gluten flour as oppose to my beloved vital wheat gluten. Here is his email reply for all of us nerds:
  
  Hi,
  
  Use a high gluten flour. King Arthur is 1 brand. Mix the flour and water and knead to make a dough. Let rest for 10 minutes, keep it covered in water. Then rinse with luke warm water until it looks stringy and the water is getting clear that rinses out. This is the point that you need to decide how much starch to rinse out, which will effect the texture. Let it rest a bit, then boil in broth stirring so it doesn’t burn to the bottom of the pot. When it floats and is cooked through it’s done.
  Learn from your errors and improve the next time.
  Blossom and Candle are very good at cooking with seitan, that’s why it tastes better. Candle has a cookbook that might help.
  I hope this helps.
  
  Gary