Regarding slowing down, you might not always have to. For example, if the enemy is nearly dead, just kill it asap because the tank may just not want to bother wasting emnity moves on something that will die in a few seconds anyway. I know as a tank that if I am tanking a few mobs, I often would do something like this... (where [1] is target flagged with a 1 sign, etc, and ignoring defence buffs etc)

1. Target [1], Flash all mobs.
2. Target [1], Fast Blade
3. Target [1], Savage Blade
4. Target [1], Rage of Halone
5. Target [2], Fast Blade
6. Target [2], Savage Blade
7. Target [3], Rage of Halone
8. Target [1], Fast Blade while checking hate levels of party members

...and from that point I would just focus on ensuring that [1], [2] and [3] all have decent hate levels.

Now, by the time I do my first Rage of Halone (move 4), I should have enough hate to pull off moves 5-7 without losing hate on Target [1]. This means that I can avoid the healer pulling hate on [2] and [3], because if I simply sit there focusing on one target then the healer will gain hate on them. Flash is another way to get past this, but in my experience it's not nearly as effective as circulating the Rage of Halone combo through multiple targets.

However, sometimes I'll have some really well geared DPS on my side and they will rip the hate meter up on target [1]. The way I see it, I can get the hate back with a Rage of Halone combo far more often than not (hell, I can often do Fast Blade and Savage Blade on the other mobs and still get the hate back with the Rage of Halone on [1], the hate boost is massive on that last hit), and if I can't, then the DPS is so strong they're going to slaughter the enemy faster than the enemy can do any significant damage to the DPS. And if it's a powerful enemy with a lot of health... Fast Blade, Savage Blade, Provoke, Rage of Halone. Bang, instantly back on top of hate and I can carry on with the combo to retain it. If I still can't retain it... the DPS is insanely powerful and needs to slow down, no question about it. I'm well geared and if someone can hold hate from me, then they can die and I will not blame myself.

I can't think of a time that I've had a party collapse using m 'circulation' method so long as I'm paying attention. Flash is good for when there are more than three mobs, though.