[SH] NL 25 KQ TP vs nit donk on the turn

Poker Stars $25.00 No Limit Hold'em - 5 players -

BB: $8.30 - VPIP: 10, PFR: 6, 3B: 0, AF: 2.0, Hands: 48
Hero (UTG): $25.00
CO: $49.01 - VPIP: 25, PFR: 20, 3B: 8, AF: 1.8, Hands: 139
BTN: $39.86 - VPIP: 25, PFR: 19, 3B: 9, AF: 2.3, Hands: 212
SB: $26.00 - VPIP: 11, PFR: 4, 3B: 5, AF: 9.0, Hands: 56

Pre Flop: ($0.35) Hero is UTG with Q K
Hero raises to $0.87, 2 folds, SB calls $0.77, 1 fold

Flop: ($1.99) 6 9 K (2 players)
SB checks, Hero bets $1.50, SB calls $1.50

Turn: ($4.99) 2 (2 players)
SB bets $2.00, Hero calls $2

River: ($8.99) 3 (2 players)
SB bets $3.50, Hero calls $3.50

Villain looks very nitty but 56 is still a small sample.

I'm thinking about a raise on the turn:
-I'd expect villain to c/r his premims on the flop: 66,99
-bet looks weak, like he wants to give himself odds to continue to draw cheaply
-I'd expect a bigger bet in case he actually has a strong made hand because nits are afraid of getting outdrawn.

So, should I make it like 7.5 on the turn to get max value from my hand?