Sounds like my transition into the AS1. My feet were very sore, no pressure points or blisters, just the bottoms of my feet would ache. I experimented with different arch inserts on the Orthomove footbed, laced them lighter, tighter, nothing helped. The stiffness of the boot took a really long time to break in, around 20 skates in them before I had that moment when I was like yep, these feel great now.
My suggestion is maybe try a different footbed, one that has a good fit for your arch, the new CCM Orthomove's have a changeable arch insert. And give them some time, the break-in will take longer in that stiffer boot.