Detonate mines + automation breakpoints

Hello, I read somewhere that you need to reach certain breakpoints to see the effects, namely automation gem to 20/20 and at least 2% global cooldown on any jewel. At this point it's faster than a server tick.

So, how does it work with mines? Right now I have 0.6 second automation cooldown, and 0,22 second detonate mines. But it seems the skill detonates mines every 0,2 second anyway and the automation cooldown is ignored?

And what about the server tick? Do I need to have both 20/20 automation gem AND 2% global cooldown jewel to see the effect? I'm on SSF so 20 gemcutters is quite a number.