Seitan has 3x-5x the protein of beyond meat by weight. It sucks that your body processes it less. For me it’s usually a treat, and I’ve never noticed any digestive issues despite having issues with more whole wheat things (beer, more natural whole wheat breads).
I’m glad you like the beyond meat though. Good for them to have actual consistent customers for the 2x / year I end up eating it!
My partner and I joke that seitan filled sandwiches are protein bread sandwiches lol. Def like the taste of seitan though!