Sounds like you just really want NightStalker to be PvP viable when it's really meant for PvE. Hunter is not underpowered, roll/reload is really useful and the only thing I'd ask is for throwing knife to do more damage.
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No hunter subclass is really meant for pvp when you think about it. Titans throw down a wall that no one can shoot through, warlock heals and over charges shields, hunters get an extra sprint button. This is the problem, hunter was meant to be fast mobile class, but it's not. Both other classes can outrun and/or out dodge. However hunters get a button that makes a short distance sprint in a direction.
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Arcstrider is useless as well. No blink, no speed advantages, grenades have been down played heavily. So on and so forth