Should I be breaking this with a rough pat 8

[Yads]

I'm in the BB with 87643. Folded to Button who raises, this usually means some kind of 2 card draw. SB reraises this usually means at least a 1 card draw. I cap. My reasoning is that I have the best hand now and I want to get the original raiser out and get it heads up with position against the SB.

(12 SB) SB draws 1, I stand pat, Button draws 2.

checked to me, I bet, both call.

(7.5 BB) SB draws 1, I stand pat, Button draws 1.

checked to me, I bet, both call

(10.5 BB) SB draws 1, I stand pat, Button stands pat. At this point I know I'm screwed and I'm not putting another dime in that pot.

checked around.

Should I be capping this hand PF or should I just call and see what develops then draw. Also if i should break, what am I breaking and drawing to?