Today after Hexatel kill, i noticed on the damage breakdown that Shock Pulse's crit rate is way too low, compared to what it should be. In RB you can easily get a few thousand SP procs in a couple of minutes of parsing, so i went to recheck it on the dummy in my dimension. Image link.
As you can see from the picture my crit chance is 23.66% and in over four thousand hits of Shock Pulse it's crit rate was only 13.12%. Seems there's something going wrong with the crit chance calculations and this skill. And i'm guessing it has to do with the Legendary version of it. I haven't tested the normal version, but we probably would have noticed that in the past before the introduction of Legendary Abilities.
Edit: my guess would be the PvP crit debuff, like it was for RB/IB.