Yesterday I killed it second time ever but for me obvious choice is BM for this fight. A did 130k without special efford. Mayby try this spec? BM is still superior on pure single target fights.
I know you wanted help more in the DPS area than in the overall fight strategy area, but i'll tell you a little something my group did that made the fight much easier.
When we first got to it, we were going to use the strategy to keep the frost head alive the entire time and only kill greens and reds. It was suggested in strategy vids we'd seen that this was the best way to do it. However by the time we would get to the last head, we'd have so many dead green heads, they'd all be in the background just chain casting those poison explosions all over the place and it was kinda horrific to heal through. We were resistant to switch strategies, because we didn't want to deal with multiple red heads in a row because that dot they put on the tanks is awful.
But eventually we decided to try killing them from right to left so it was green > blue > red > green > blue > red > green like that and we killed it on the very first try, quite easily too. It's actually kinda mindblowing how much easier it was doing it this way as opposed to leaving blue alive the entire time. Now megaera is just another boss we one-shot on our weekly clears.
I don't know if you're raid is doing that "keep blue alive" strategy or not, but just thought i'd throw this out here just in case.
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Try 4 healing it. Your dps is good.
http://www.worldoflogs.com/reports/r...?s=8228&e=8636. Pure single target. To be exact I did 128k and it was rank #42. But it's normal, and with my gear i should do more. Maybe next week I'll try SV, just to compare.