Well I haven't done the fight before, But after small panic from this question, I ran to google crying and hoping to find something, so far, I haven't found a strat video for the fight, Just reg mode but I'm still looking however, I did find a very helpful thread which gave me some pro tips on how to not fail at this:
For infest to help out the healers, I will have a AM set for a whisper/raid tell, Since you guys don't have many paladins I think it would be a great deal of help.
For the plague obviously have my ctrl click for my cleanse to help if needed
To help with DPS for valks I will have a fast switch macro to change to SoC to be lol cleave dps, and a RF to help keep the angles off of the healers.
I have had Sac on my bars since day one to save ANYONE regardless of the fight.
For vile spirits, I have this nifty spell that allows me to eat damn near anything that wants to fuck with me, Helps out the raid in that situation.
I know how evil defiles can be, My other guild struggled quiet a bit on them but most of them hadn't had their helmets removed yet.
To prevent defile from face fucking me or making me look stupid I have always ran away 2 seconds before it has came out, Worse come to worse I have rocket boots to save my ass and if that even goes worse, I normally keep some of those neat run faster potions on me just because they can be a saver when it comes to a sticky position.
I am as I type this watching a paragon video of their HM LK Kill, I'm not sure how you guys run and do the fight, But I'm a fast learner. And I will never come to a raid without knowing what the hell I'm doing. (I can always ask one of the officers how you guys run it)