Oh, and to the OP:
Maysis aren't really that stiff. Unless you are a pure jibber, I wouldn't worry at all about them being overstiff.
Also, the inside boa on the k2 boots works amazingly well at holding your ankle/heel down. You can crank it tight when needed, and release it when not, and have essentially a variable stiff boot.
If the k2 fits well go for it, you won't be sorry.