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In my opinion, it's not worth it to bend a brand new set of FKS...especially since word is that the brake material is not as strong on the brakes as it used to be on the older bindings.
With that said, I've been told by lots of people that you can run FKS 90's/Look 95's on a 100mm waist ski no problem. You might have to tweak them a tad once they're on the ski but nothing like a full bend job that most do.