So I am looking at my feats- I'm trying to build the best bear tank that I can, planning to 25. I feel like cleave/ great cleave are essential for clicky dps increase and multimob aggro, but I'm not -incredibly- married to them if someone tells me they HAVE to go and just aren't worth it. I have the feeling that Cleave/ GC are the secret to druid success but this is only from my play experience and as I haven't played DDO in multiple years I'll bow my head if there's a good argument. Okay, feats:

1: Toughness
1(H): Power Attack
3: Cleave
6 Great Cleave
9: Natural Fighting
12: Natural Fighting
15: Natural Fighting
18: Shield Mastery
21: Epic Tougness (con 16+3+2 level ups for the 21 prereq)
24: Improved Shield Mastery (unyielding sentinel- want to qualify for legendary sh mastery)

I see Bulwark of Defense and I'd like to fit that in, though I'm not 100% what qualifies as a defensive stance. Any suggestions on changing the lineup, or does this work for the Beartank?