The skunk apes are super wide. Even with a size 12 boot, you don't need a WIDE board... you just need a wider/mid-wide.
The Heritage X in 159 has a waist of 26.1 cm... which I think would be perfect and playful for you. I know the difference between 26.1 and 26.8 (skunk ape and Heritage X 163) does not seem like much, but it is most definitely noticeable, and the NS will be faster edge to edge.
I have a size 11 boot (6'3", 200 lbs) and ride a 157 Proto CT with a waist of 25.3 and I have yet to get any toe or heel drag, even while throwing deep carves down black trails.
Go for the Heritage X 159. You will be very happy with that size.