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.
14 NeverSummer Prospector Splitboard . 14 NeverSummer Proto HD . 13 NeverSummer Cobra . 13 Gnu Space Case EC2PTX. 11 Nitro Team Gullwing
14 Now Drive . 13 Now IPO . 13 Salomon Hologram
14 Flow Hylite . 13 32 Binary