Matt Pierce wrote an answer about Capita Horrorscope FK Snowboard on August 22, 2014
I realize you posted this months ago, but at that weight and height, I would not recommend anything smaller than a 153. In fact, I am only 10 lbs heavier and 1" taller and I will not even go below a 156. Sure, the smaller boards are super fun, but they are extremely limited in application.
If you do wish to go that small, at least get something with some sort of grip technology like Never Summer's variogrip or Smokin's magnetraction. A radial sidecut will wash out.
Just FYI, 5cm is a huge difference.
As for the size 12 boots, of course they will drag on a small board. If you want a fun board that accommodates your foot size, check out the Never Summer Revolver, Nitro Rook, or Nitro Glory Stomper in 153-154cm.