Replying to Low-Volume Footboard Options

Boot: Nordica Ace 3 Star
Footboard: SuperFeet Green
Modifications: 6th toe stretch & tongue grind to soften flex

I'm having a couple mild issues with my boots that have presented after a few weeks of riding fairly hard. Perhaps it is the result of wearing my boots too tight, but perhaps it is also an issue with my current foot board. I recognize that drop-in boards are not an ideal solution, but I was constrained at the time and they have worked surprisingly well. They have helped give me more arch support and support in the forefoot (meaning my foot won't splay out into the sides of the shell if I under/overshoot). In addition, they helped to correct some stance issue that were essentially sending both knees into valgus when clicked into skis.

I'm having some issues with circulation, particularly when the lift line gets too long. I find that if I'm standing in my boots for 20-25 minutes, just waiting in line, my feet start to go numb. I'm wondering if this is a direct result of the foot board shrinking the amount of space I have in the instep. In addition, I feel like my heel is not as secure as it could be seeing as the board kind of elevates the heel.

I realize the obvious solution is to spring for some custom boards. My issue is, however, I do not trust the shops in my area. For one, I have to spend $35 to park in the Gov't Center Garage by TD Garden just to get to one. Another local fitter is not particularly skilled. Ultimately, I'm looking for a DIY solution to reduce the volume of the foot board.

Any help is much appreciated.