From OP:
On Five, I am pretty sure I'm between bare Kings (limper in seat 8 who probably has Broadway cards in the hole) and Kings-up (decent, aggressive player in seat 4 who may also just have Kings, but I lean towards two pair)
So lets give seat 4 two pair----------
2s Kc) Kh 5s 2d
and seat 8 broadway cards with an ace-
As Qd) Ks Kd 6d
Our equity here is 48%
Jam it jam it jam it.