That soft tip and tail(end) makes them hand flex softer(talking about 09s and 2010s, 08s are real soft all over), but they will ski stiffer than Thalls, which will butter at the ideal spot right by the binding. Hand flexing can be decieving.
And mounting, I would go -2.5 since that is what they were made for, that is wher they will carve better, the equal swing weight idea is pretty stupid(for people that say center), and people who say center can't compare them to where they were made to be mounted. Armada designed the ski so why don't you listen to them..