I wouldn't call the THalls flexy, or at least pigeon hole them as such.
They ski like an AR7 underfoot (a pretty damn stiff park ski) but just have a slightly more flexible nose to them. You'll be fine on them even on big ass jumps.
I'm in the same boat being 6'5" I always wish for like an AR7 in a 183 or so, especially in Armada but don't want to ski the El Rey 185 or the Al Dente 188.