I'm looking to build a set of disc wheels for gravel grinding. I'm looking at Stans Grail or Alpha 400 (a little lighter). Is the Grail rim significantly stronger? I'll be running 700x40 semi slicks most of the time and do tend to bomb down hills with a bit of reckless abandon. I realize the Alpha 400 is basically designed for rim brakes. However, I've built numerous road disc wheels using Alpa 340s with no problems. Thanks in advance for your thoughts.