Looks like I'm pronator, my foot rolls inside, pushing my ankle's inside bone more inside and that reduces the gap between bone and boot to minimum. That hurts. There is enough space if ankle is in the middle of the boot. Unfortunately I did not notice that when I bought my boots, or it became worse.
What should I start with?
1. Custom footbeds like Sidas Winter Custom Pro. will they help me? No additional support for the foot... not sure.
2. Pushing the outer shell out where my anklebone is.
Unfortunately I don't have a good boot fitter near me, but there are guys who can heat and pull boot's outer shell...