Stack management and taking -CEV situations big stacked

[ChipSpeak]

Although villain has been very well behaved, I am ~40% against even the tightest 30%+, any stack concerns from making this anything but an instacall? My way of thinking is this is a very good +$EV situation and am willing to give away odds with this stack. At what point or effective stacks are we folding? ie, villain has another 5k making it 16k to me, we are just slightly behind the math, but our stack can take a gamble, where's the long term +$EV break point here as -CEV is established?

Full Tilt Poker, NL Hold'em Tournament, 1,000/2,000 Blinds, 250 Ante, 7 Players
LeggoPoker.com Hand History Converter

UTG: 24,074
UTG+1: 32,951
MP: 19,102
CO: 58,983
BTN: 13,271
SB: 81,220
Hero (BB): 72,692

Pre-Flop: (4,750) Kd 7h dealt to Hero (BB)
UTG folds, 3 folds, BTN raises to 13,021 and is All-In, SB folds, Hero calls 11,021