I would think you'd want a softer flex for more flexibility. The nice thing about the new urethane backed bindings is that they're designed to still give you enough control for heel/toe carving.
15 LibTech TRS HP . 15 NS Snowtrooper . 15 NS Ripsaw . 13 Salomon Pow Snake
15 Now Drive . 14 Now Drive
14 Flow Hylite