I still find that if I really crank down on the lower cuff buckle, it puts some pressure on the top of my arch.
I've found that if I wrap the boot shell a little differently than normal, it completely removes the problem, allowing me to thighten the cuff as much as I want without affecting my arch.
For example, on my left boot in the picture below, I put the left cuff flap under the right arch flap. The right cuff flap with the buckles is on top, with the right arch flap (which makes a little transition up to the cuff) sandwiched between the two cuff flaps. This only works if the cuff flap is large enough to slide between the right side of the boot and the shell (doesn't work on lower end recreational boots).
This comes from my son, who said doing it this way makes his 130 flex race boots a lot more comfortable.
So are we crazy, or have other people tried it?