I'm not familiar with the Switchbacks, but the Flux DS is definitely too soft. I have a Charlie Slasher and I like a medium to mid-stiff binding on it. Stiff would work too, I just personally don't really care for stiff bindings in general.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz