Bad foot pain while riding

Hey all, hoping to get some help. I’ve been snowboarding a couples times now. Every time, I experience really bad foot pain in the bottom of my foot / arch. It usually goes away after stopping for a minute or 2.

My hypothesis is that it’s from heel lift. I thought this meant I needed smaller boots but my toes are already up against edge of boots (lightly so). So I tried a size smaller at the rental place and my toes were pushing up quite a bit which isn’t ideal either so not sure it’s that.

I then believed it was my form or technique. I thought maybe I wasn’t leaning my shins forward enough on toe side but I experimented a bit and found that even when I was really leaning forward. My heel was still lifting.

Not totally sure what to do? Can’t really go more than 5 or so minutes before I need to break from pain. I read online about j bars. Maybe they can help?