Fastest way to re-apply shock / cooldown on shock application?

I am playing with primal strike as my single target dps skill (alongside storm lances). I have a pet with shocking trail so bosses should always have a shock to consume.

The issue I am having, is that with sufficient attack speed, it seems that a lot of the time the shock is being consumed by primal strike, and then not being applied quickly enough to be taken advantage of again immediately.

I also have this issue with pets that 'always shock on hit', and they aren't actually shocking every time they hit after shock is consumed.

So my question is this: is there an internal cooldown on shock re-application?

Yes, there's a 1 second cooldown on all debuff reapplications after being "consumed". I had the same question about bleed.