I also have a 26.5 FT Boot (although that doesn't really matter)
It took me about 10 days of skiing to fully break the boot in. During the first few days I couldn't ski more than 3-5 runs at a time because the liner hurt so damn much. I even went back to the shop to have it heat molded a 2nd time. Just give it about 7-10 days and then you'll feel much better.