Thats almost correct, shadowflare comes after fester.
The one thing i tell all summoners, and i cant stress this enough, summoners do NOT have a set "rotation" we have a priority order, should go without saying but there's a lot of people who don't get it.
Also, for aoe you should hit a miasma II after the bane, once everything is dotted up if its 4 or less targets in total, go ahead and spam a few blizzard II if you can spare the mana, otherwise, just ruin the ones with higher hp, any more than 4 targets and you will need to keep refreshing all the dots since they will fall off by the time your done casting on the others.
Aside from that, unless you need to save your cooldowns for a particular phase, make sure your rotating them when they are up, we dont have the best cooldowns compared to other classes but it all adds up.
final note, again should go without saying but keep aetherflow on cooldown at all times.