I almost had it last night.

My strat was to sticky target the first 3 adds assign a DPS to each. The tank on Shaffar. It worked pretty well. I got the adds down quick. DPSed Shaffar. When a beacon spawned I used TAB to switch targets for everyone and killed it asap. Somewhere down the line a TAB screwed up and a beacon got away from me. I think I got Shaffar down to 20-30%.

Was a bit too hectic and I might have had mana issues as well. This was with everyone at 66. I am going to setup a macro to specifically target beacons as suggested a few posts back and give it another go. Once I have the beacons under control I can start paying attention to other things like healer/dps mana and dps output on Shaffar.

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AOE: I don't think AOEs are an option. The beacons don't seem to have the normal aggro mechanics. They seem to be like the Curator spawns in Kara. I rarely get the beacons grouped properly for AOE.

Tanking all 3 as well as Shaffar is not an option as it is just too much incoming damage. Assigning 1 dps to each of the beacons at the start seems the best approach for me and I seem to get through the initial pull muich better now. Mostly focusing on getting the subsequent beacons down and getting Shaffar down now.