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 NS Ripsaw . 14 NS Proto HD . 14 NS Cobra . 13 Gnu Space Case EC2 . 2013 Salomon Pow Snake
14 Now Drive . 13 Now IPO
14 Flow Hylite