X2 here. The more padding, the less final pressure after it's done. I also add stuff around and between my toes to spread them out for wiggle room. I also add padding to that bump on top of the foot, my pointy ankle bones, and the bump on the outside of my foot.
It feels awful when you first buckle up the boot with all this stuff, but it is good later. 10 minutes of discomfort for on-hill comfort!
Neoprene paddling socks are relatively cheap (well, they were 10 years ago!) and give lots of material for toe caps and padding. Scotch tape holds well on skin. Then tape your insole to your foot and add a super thin sock over it all to keep the bits in place.