Aye, thanks for the replies. As mentioned, we attempted to CC mobs via snare/root off/kite and that caused more problems than anything. This is what I posted on SOE forums. I actually started the mission at lvl 84 with 5% of exp left for 85, when we first started

Below is basically my experience from the 4 tries and 1 win.
As a ranger, tanked this mission (shudders) with mix of Tier 3 group, 3 pieces Fabled and 3 pieces Cultural/Demi, cleric, another ranger, beastlord, druid and wizard, with 1.5-2k AA. Buffed/Tribute 30k hp/4.1k ac. I felt really sorry for the cleric, poor thing. All other members approx same progression level, I won out as tank as I had the most AC (lazy beastlord), and switched between shield/dps.
* Mobs' hp varied from approx 170k to 240k, but round it off to 200k.
* Spawn timer is every 45 secs
* 200k/45 secs = 4444.4 group dps, or 4/6 toons 1111.1 dps/each. Top end 5333.33 group dps, 1333.33 dps/each for 240k mobs.
* A group would be ok if they allowed one to escape for every 5 mobs killed.
* Do NOT try to CC right off the bat (learned that lesson on 4th attempt. 5th attempt no cc, won). This allowed druid to concentrate on dot/backup heals.
* For our group, overall 4100 dps/group, inwhich 5-6 reached RCC zone before 35th mob was killed.
* Likely start burning discs early, so they will refresh a few times during the mission, as the mission length would be approx 30 minutes (40 mobs spawned total, which 5 gets by).