2nd barrel AK UI? standard?

[noob_sauce]

at work no hand history... was just curious about what percentage of you guys fire a second barrell at this pot OOP given the action, or whether this is majorly -EV...

.25/.50 Poker stars, both stacks are at $50

Hero just posted first hand one hand earlier no reads at all...

gets dealt A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] in sb...

utg raises to $1.50, all folds, hero pops it to $5, bb folds, utg calls...

Flop comes: (HU, $10.50)
236 r... no clubs

hero bets $7, villain calls.

turn comes: J pot is (about $28)

hero leads out for $16... if i decide to fire out here do i need to go 3/4 of pot+ here on the turn?