3/6 NL - Spewy or Spunky?

[OhioRounder]

We're the only two left at a FR table. I rarely play HU cash, usually just when I start tables. Villain is a laggy SOB, sometimes too aggro. So why not sit around for a bit and see if I can take advantage.

At any rate, I've been going back and forth trading chips with this dude for ~60 hands. Almost every time I didn't insta-raise pre, he'd 3bet... and he's donked a lot of flops but gives up a lot on the turn OOP. When he donks the turn again, I put him on the King.

My reason for calling the turn is I believe I can take the pot away with any diamond, Ace or Jack with an overbet - esp. if he checks it. I just feel icky using scare card outs HU... thoughts?

$3/$6 No Limit Holdem
2 Players
Hand Conversion Powered by weaktight.com

Stacks:
SB Hero ($728)
BB Villain ($606)

Pre-Flop: ($9, 2 players) Hero is SB
Hero raises to $12, Villain raises to $42, Hero calls $30

Flop: ($84, 2 players)
Villain bets $54, Hero calls $54

Turn: ($192, 2 players)
Villain bets $102, Hero calls $102

River: ($396, 2 players)
Villain checks, Hero bets $422, Villain...