How funny we do the opposite for a couple reasons.
1. Stormcaller controls the entire fight, defensive systems is triggered by Stormcallers health so you should always know when it's coming 80% 60% 40% and 20%
2. Probably a bug but we start getting random bubbles if Firebrands health is lower then Stormcallers.
What we do is get Stormcaller about 5% ahead then we have our 2 highest dps stay on it. At the last defensive systems 20% we have are two ranged jump on Stormcaller for DD then we have our two Marauders on Firebrand we burn Stormcaller to about 8% then focus everything on Firebrand until its dead then flip back to Stormcaller FTW!
Once we really got into and realized what controls the defensive systems it's become really easy for us to do. Same strat for HM. Also we keep our tanks Firebrand at about 2O'clock and Stormcaller about 10 O'clock with our DPS at 6 ish on both.
Never thought of it that way, but every time we killed stormcaller first, Firebrands soft enrage is pretty tough to live through as it does his mortar barrage's until it's dead.
My question is though, if the defensive systems are based on stormcallers health, why not have your 2 weaker dps there to extend the period for dps to be done instead of your 2 best who will speed up the defensive systems from coming up?