Provoke gives you hate equal to that of the highest person on the hate list plus 1. Almost completely useless for initial hate. As far as I know stun doesn't work on them either.

The nodes spawn every 40 seconds, the first should be about 5 seconds after ADS uses high voltage for the second time. When I used to offtank this as a warrior I'd plan to be at the entrance to the arena a few seconds before the first node is supposed to spawn. Rather than tomahawk I prefer to use overpower. The cost is about the same but overpower is a bit more enmity at almost the same range of use. After the second overpower it's business as usual. Dodge the aoes and try to hit the nodes with storms path and butchers block, 40 seconds after the first one spawns the second will spawn, with some practice it's possible to have butchers block ready right as the second node is spawning, that will serve to really solidify hate on you.

Cool down usage is kind of up in the air at this point. I generally won't use any cool downs beyond inner beast for the first node, unless it's an attack node. Dirty bomb is bad news. Once the second node is out I'll use vengeance and bloodbath, then convalescence and thrill of battle.

Truth be told I rarely see a second node any more. Unless absolutely all the dps are under i80 you really should only ever have to deal with one node. If the dps are really kicking you can skip the adds entirely.