I just got the Vapen size 10,5 although I wear 10 on sneakers. My left foot is half a size bigger and the 10,5's I got fits my left foot feels snug, and it's little bit looser on the right side. After I break in the boots, if I feel like I have heel lift, I'll just buy some J-L bars or wear some thicker socks to solve that problem.. I won't be riding more than 15 days this season so it shouldn't be a problem...
I was going to get the ZF1's but I didn't want to spend $50 more and the Vapens felt stiff enough for me