May be a bit late, and I'm not an amazing pvp player (I can hold my own and come top of most matches but don't have amazing kd), but I have some advice for blink as I main a bladedancer or Voidwalker
Go into a patrol and practise the blink timings, such that you can go up, forwards or any direction consistently. Then go to somewhere like CE bridge and use the pillars as accuracy testers - once you can blink between pillars without missing your mark, you know your limits.
In crucible, by using your radar effectively you can set up shotgun ambushes by appearing unexpectedly [i]behind[/i] an enemy. This is really the key to blink - disorient enemies and appear behind them with a shotgun.
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As for when to blink in - don't do it in a situation where you know you'll win the firefight, blink is best used to either get out of the way or close the gap on a group to kill with your super. Hungering blade is a must so that you can regen health asap if needed. Sorry for the essays, and I hope somehow you can pick re points out of it. Happy hunting guardian!