I finished the event at lunch time today on casual pvp, refreshing until 2-4 stones were available
Hmm, i'm lvl 1k+ and it's not an issue. I'm also on Xbox, maybe it's just softer. DB/Bombots x2/Manacles. Sure I lose a few here and there, but it's generally a steamroll.
That just isn't an option more often than not unfortunately, but I do try to use them if it's viable.