Awesome. Did you run beef tubes in the prototype axles? If not, maybe they aren't needed and are durable as is....hmmmmmmmmm
I didn't run anything in the prototype axles. In fact, I like them with a little flex (and by a little, I really do mean hardly any). I don't recommend a rigid no slop locker. If you use a regular locker with a little slop, you have some give and the housing takes the abuse instead of the metal internal axle and locker.
It was a fortunate side effect of the design. There's just enough give that it has increased durability and compliance. That's the huge benefit of the material we are using, it's slick, tough, and strong.