They still have lots of room for balancing. Euphoria could have Starsurge provide 6s of 20% Haste (temporarily speeding non-snapshotting DoTs). BoP could also make the next tick do extra damage when the DoT is extended (Wrath gives 50% to next Sunfire tick, Starfire gives 75% to next MF tick).
Both of those talents are intrinsically weak in multi-target, because they require you to cast nukes to get any benefit. As a rule, we don't cast many nukes in multi-target situations, particularly if Starfall is stronger than Starsurge at 2+ or 3+ targets.
Alternatively they could just make Stellar Flare weaker. It should certainly have its direct damage have lower DPET than Wrath's (I'm looking at coefficients in WoWDB). I do believe that having individual Flare ticks (every 3s) at the same strength as the other DoTs (every 2s) is reasonable.