I am under the impression that you are talking about the Pivot 10's, not the FKS.
And as stated above me, they both do adjust, just not the same amount as each other.
If you have the P10 that I am thinking of, they would normally adjust down 2 shell sizes{27(5)->25(5)} easily, but it would all depend on the amount of room left on the heel track when they were originally mounted.
Hope that makes sense.