Wide boards are generally only a couple cm's bigger.. built so that there is no boot drag, it is a general rule that boot size 11 and up should be on wide boards, you should be fine, unless you're worried about the length.
The 156 Wide is 26.5 at the waist and 27.3 at the inserts. Your size 11 is 29 cm. That leaves you 1.7 cm of barefoot overhang at staright angles. That leaves you plenty of room to adjust for your stace width and actual angles. You should not consider this a wide model for you. In terms of width, it is a great fit!