try Ride Insano. Equipped with Boa system, it's their stiffest model. love em,
I actually tried these on yesterday..... they are the only boot with a boa that has not killed my foot. I did have a slight pressure point on my ankle but they swapped foot beds and they where perfect.
One thing i liked for sure is i could crank them down and they were nice and stiff or i could back them off a bit to get more flex if i wanted too and still no heel lift.
May actually end up buying these.