They also reduced the amount of arrows need from 700 to 600. NOW it's possible to get Ophelia without spending gems (if you can beat Lv12 and already startet collecting arrows)

And yes i got more often 6 arrows per run so the droprate is now like ~4

At least they try to balance it, but this should happen before the event gets rushed out. More specialy if ppl start to ignore the event and now they lost time to go back on it even with the change.