You shoudl definitely be riding a 160. As snowolf said, NS boards have a longer effective edge than similarly sized boards from other brands. For instance my Heritage 158 has more effective edge than a Nitro TG 159 that I used to have.
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