I wanted to love this boot - Scarpa SL Active Backpacking Shoes - Men's

First, the construction of this boot is amazing. Solid and seems to be comfortable. However, I’ve hiked about 50 miles and I get massive blisters on my heels. I’ve tried different socks, lace tightnesses, etc. I also sent a note to scarpa to get their thoughts and they never responded…which is lame for such a premium boot. They seem to be the correct size…size 50 which is as big as they get and are supposed to be equivalent to size 16 (US). Unfortunately these are just not very comfortable…I have numerous hiking boots that cost half as much that are WAY more comfortable. I’ll keep trying to break these in but my guess is they are a lost cause.