You will probably never be able to stamp them, they are mainly designed for plain saddle bags or chaps. You might be able to do some light carving.
I hate to bash tandy, but they are a corporation & most of the leather they get is from Mexico. Mexico as you may know has a very different way of tanning. The leather is also over stretched, causing stretch marks. tandy just recently started handling Herman Oak, although in limited quantity.
All of my leather is purchased from Springfield Leather Company. Iv never had an issue with them.