You have 13bb's... really you should just be shoving pre.
Only time I'm considering not shoving preflop here is > if there's tons of SS's & if players to my left are too dumb to realize that anything less than a shove is obviously gonna be a monster (hoping they are stupid & are assuming a raise of say 2.2-2.5x is a steal... because really we should just be shoving in this spot (13bb otb)). If I were in SB I'd be thinking you were only holding something like AA,KK, maybe QQ?... because (as mentioned) you should just be shoving here. 'BUT' obviously the player in SB is a fish if he's calling here OOP w/o implied odds
with a hand like 86s.
Question for ya: You raise AK 3.5bb's otb... SB calls... now what are you doing if you wiff the flop? (2/3 of the time).
note: Alot of fish seem to think they're 50/50 with a flush draw on the flop... this is only the case if they've got a FD & 2 overs (& aren't up against an overpr)