My rotation is similar to Donjo.
Sword Oath and 2 full RoH combos. Shield Oath during slam, then run to the side where tail will appear. After slide, FoF > target tail > FB > SW > SB > CoS > (position northerly) RoH > run north and Shield Lob add tail side > run back towards tail w/ another Shield Lob > position it to where the add is in the AoEs (if they're there, northerly so melee don't get hit by tail swipe) > uncomboed RoH > then continue tanking the add solo but CoS should be up which should help with the tail.
This is assuming the head/tail popped south after slam. If it pops north: FoF > target tail > FB > SW > SB > RoH > target add + uncomboed RoH > CoS. The only time the tail should lose threat is if the dps did not switch to the adds fast enough.
For the mage add: FB > SB > run head side and target mage add > RoH > CoS > uncomboed RoH x2 > stun lock. Save SW for the end of stun lock in case dps don't kill it in time and you may silence one of his cast, I forget which.