Thanks for your thoughts. As I mentioned, I seem to be ok with the Color so far - which is under a cm shorter.
I used the mounting option with the Forces that allows horizontal (travel across the board width) movement; and pushed them back so the heel is at the rear edge; and turned them at 15 degrees, which feels good anyway.
Basically the boots take the whole width and really dominate the board, but don't seem to dig in.
The difference in width between the top and bottom boards is less than a cm anyway.. The only way to add more would be a with a wide board; and the smallest one is 157.. Which kinda defeats the point in going small; and only adds 1.5cm.
So, for £200, I think I'll chance it!