Well, if you like the Salomons and find it comfortable it is for you. The don't fit all so good, but if they fit you, it'd perfect. Personally i got 6 Salomon pairs total(2 for summer, 2 for winter, skates and snoboard). I bought 2 of them without trying out before, and they fit perfect to me. All US13 size. I mean if you find Factions comfy, you'll find any Salomons comfe too.
If you want to get a stiff one try something like Synapse, or F20-F22-F24 if you want to get more freestyle oriented boot(as ion is top level FREESTYLE boot). That'd be better choice, then talking about what's wrong with ion's.
I don't think that loosen a boot is a good idea. It should fit tight IMHO.