What's your group size? We were at 10 last night and sometimes have 11. We lost two players due to Classic which kinda limited our numbers even moreso (though I prefer raiding with smaller groups)Ah, you're going with kiting her? We did that in Normal, but from discussion with a few other people who'd done some pugging, when we changed to heroic we found that a simpler strategy worked for us, where we keep everything focussed around the central rune; that was a big advantage because it meant we were already well-positioned to deal with the suiciding minions when they attacked. Said strategy may depend on group size to keep the rune power level under control, though.
I wouldn't change anything if you're now at 5%, but I went from not liking the new strategy at first with really liking how it helped immensely with sensible positioning and swapping targets as required.
Our strategy works well enough but if we have a similar group size perhaps switching it up to your method would be worth trying!