Size: 143-145 sounds about right for size for your weight.
What sort of park riding are you doing? The K2 WWW and Ride Artifact are both really soft jib snowboards, I wouldn't be hitting any jumps on them but if you're just riding rails they're great.
Don't be afraid of flat camber snowboards, they perform great, very similar to riding a camber snowboard. Rocker isn't everything, in fact a lot of companies still haven't got their rocker technology quite right.
If you want something that's not just a jib snowboard, but can handle jumps well too I'd have a look at a K2 Parkstar or Darkstar.
I teach snowboarding via step-by-step videos lessons at
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