For a hollower steeper wave like bigger offshore winter NJ/NC you want a board with less tail rocker and more nose rocker, and a more pulled in tail to set your line. Honestly I don't see alot of performance top to bottom manuevers going on when it's big in NJ...it's drop in late, pull in and set your line. The last thing you want is a board that's easy to release the tail on in big days here.
Listen to these guys...they know.
you want something that you can paddle easily and goes fast down the line... your main goal is to catch and make waves (and hopefully pull into AND MAKE a few big barrels). Combine that with the fact that you're an average ability surfer willing to take on some size, and I'd suggest that you go with something much longer than what's been suggested... 6'2, minimum. Why mess around?