you dont need 6 tyres for a directional tread...just rotate the four you got, and have a non directional tyre as a spare.
Thats what I do.
in regards to not having too much sideways grip, my silverstone grip pretty good sideways in mud and they are not that far removed from claws in design.
The MTZ's get the 3 ply sidewalls in most sizes whereas the Claws only get 2 ply, claws get the 3ply with those larger special order sizes.
each to their own....Id consider claws next time round, their 305/70x16 is only 11.9 wide compare to toher 305's that are 12.5 inches and more.
Oh, and the CLAWS have the Visual Impact aswell