We downed him today on fourth overall attempt, after 34%, 13% and 11%.
We used consumables after the first attempt, meaning food, potions and rum, but no stoneshield pots, since nobody had any

Our small supply of potions was used up after the third attempt but it looked like we really could do this without any extra buffage, Infernal landing points are, in my opinon, more than 50% of this fight. Our 13% wipe resulted from almost perfect (speaking from Malchezaar's point of view here) Infernal landings, two boxed in the raid with overlapping damage zones, one landed on top of me and by then it was pretty much over.
In the fight that lead to the eventual kill, I had to move once, for about 5 yards, the raid never moved at all. Pie.
We were all surprised at how easy this fight can be, if you get a bit of luck. Moroes is harder, Aran is harder.
From my brief ovservations during and after the fight, an agility pot is the most useful on the tank, if you want to go light on consumables. I sassume food and rum are a given. We had a lot of overhealing in phase one, I took very little damage there and people were assuming a hard-hitting boss. I got zero damage for 8 second intervals, repeatedly.
Oh yeah, we fought him on the platform.

take care
Tarabulus