It's been a few years but I've actually built those same footbeds for a season not the best for 95% of snowboarders. Every foot is completely different but I will say that AMFIT aka SureFoot is pure crap for snowboarders. I can't stress that enough.
Also typically if you're an active rider your foot shape changes every year (100 day a year rider) now if you're an average rider or weekend warrior you can get about 3 to 5 seasons out of a footbed. I try to get a new one every other year.
Can't say what does and doesn't work for each of you as I'm not staring at your feet.
Have you wrote up an article on this topic before? If so care to provide a link to it? I'm interested in learning more on the custom as I currently have an off-the-shelf brand that are doing an ok job, but I have high arches and could use a little more support.