What's the recommended Shifter Iconic Bear melee level split these days? I'm after the druid PL.

I've seen 13 Druid / 6 Barb / 1 FVS, 15 Druid / 5 Barb and 12 Barb / 3 Druid / 5 Cleric.

I'm partial to the 15/5 vs 16/4 but I guess the split is Ravager core 3 vs 8th level spells.

Are there any other breakpoints to be aware of?