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i love the 6, i could be wrong but i think it's loosely (loosely) compared to a 100-110 in another boot?
i have the 6 in my boots and i ski completely park, they are super stable and allow me to drive my skies much more than previous boots that i have used. i had a rossignol 50-flex boot before, and i will never go soft again.
I don't know the conversion, but I ride an 8 in Little Cotton Wood (inbounds free-ride and mild BC), and a 4 in the park. 4 feels flimsy at Alta, while 8 feels almost dangerous in the park. 6 should be comfortable just about anywhere.