Testing of Naxo and Fritschi binding slop and foot retention is difficult. Most factors can be equalized, but adjustment of the toe jaws up and down makes a significant difference in boot movement

How to modify a ski boot to make it stiffer and ski downhill better and be easier to use, Scarpa Laser worked here, techniques apply to any backcountry skiing touring boot.

Dynafit bindings have a long tradition of aftermarket modifications, check out this early and effective sculpting of the venerable TLT, to make backcountry skiing safer and easier.