Not sure about the Crawdaunt - I'd try to get Guillotine in there. Others may disagree, but OHKO moves always seem to screw up carefully laid plans, and having one on the team is a good idea. I'd probably lose Brick Break to do so. Mebbe Double Team to give it some breathing space for Guillotine...
Surf is something to consider over Crabhammer - the much better accuracy and slightly higher power makes up for not having increased critical chances IMHO. If he had Scope Lens then maybe.
Definitely Return over Hyper Voice for Exploud.