Since I am an abject failure at math... maybe someone can help me out here and point out where my thinking is stinkin'.

Folded to me in SB with AQo.
I 4x (16x left in my stack) BB calls. (8x pot)

Flop Kxx.

I cbet around 6x (10x left in my stack, 13x pot)

Villain shoves (29x in the pot and I have to call 10x, getting roughly 3:1). Assuming I'm behind to a one pair King, this leaves me with about 13% equity and 6 outs. 3:1 means I need 25% equity to break even, so this is a fold with half my stack in the pot?

Why does that sound wrong to me?