Collegiate Calamity delve T11 with Balance druid

I ran my balance druid through CC with Valeera set to tank mode. It worked well enough, overall. But certain mobs seem to rip through her like a hot knife through butter. After a bit of reading on the web it looks like her tank aspect is kind of bugged. It is suggested that DPS is less prone to folding, holds aggro better AND does more damage. Go figure yet another thing in this expac where things work in a way VASTLY different from how they are advertised.