MoX will be posting our 10 stack kill shortly. In ours, you can see that we did a split up of ranged dps into two groups on the outside, keeping the group numbers on the smaller side. This meant that puddles were more effective on the concentrated group, making sure that everyone got healing as opposed to running the risk of random ticks on random people who may or may not need it. This was something we thought up of while doing 5 stack pre-nerf and it got us very far. Do what you think is best though, as sometimes you may not have the right classes/people on for certain tactics.
DPS wise my guild is good on this fight. But we'd appreciate all the tanking and healing advice you could possibly give.