If your toes aren't even touching the front of the boot, before it's packed out, the boot is too big. You're going to have too much space/slop inside, and that's probably what's casuing your discomfort.
I got a new pair of Kaijus this season, and heat molded them. The first day I was out on them, the toes on my left foot went numb. Second day, they were starting to feel really similar to my old Kaijus. Third day, couldn't even tell they were different than my old pair.
I really hope it works out because I can't return them it's to late. The liner is fits just right and my foot is to the front of that. Idk the boot feels fine without that insole. I will just have to ride them a few times and see what happens. If it doesn't get better after a few days I will just try and sell them or something.
Thanks for all the responses