Here's a log of my first attempt at it using MNK tanks. Entire setup was:
Thornyy(RDM/NIN)
Thornspet(RDM/NIN)
Solanis(BRD/WHM)
Ninian(BRD/BLM)
Makod(MNK)
Strifebringer(MNK)
Athras(BLM)
Celille(BLM)
Arcas(THF)
Have done it a few times since with the 6man setup and a THF in second party, but unfortunately only have access to my laptop at the moment and did those on desktop. Mega scissors is stunnable, not sure on the guy's venom shower report as in my experience it seems to have a minimum recast time to reuse.. have never seen it spammed. One BLM died after mega scissors back to back, and the THF died to aoe putting feint up. While hate got messy after scissors, I was using dual RDM/NINs with my enmity- sets disabled in case the MNKs died. Using RDM and WHM and curing in enmity- makes it much more managable. Total fight time was 9 minutes, but have done faster since then with mega scissors stunned and optimal setup.
http://www.rapidshare.com/files/3835...katoa.txt.html
During my first attempt, I went RDM/NIN x2 because I was wary of the MNKs ability to damage it and hold hate, and wanted to have a backup plan to avoid wasting pops if possible. For the same reason, I did not use an enmity- set on that pop, which made the fight significantly messier than it needed to be. It was a learning experience, but RDM/DRK and WHM/SCH utilizing enm- sets is certainly superior. Due to the amount of responsibility a RDM has in that fight, not all mega scissors will get stunned anyway, but the BLMs didn't stun a single mega scissors in that fight and despite me not using enmity- gear the MNKs did not have issue getting hate back over me in a timely manner(though they couldn't get it back from Celille).