25/50 river vs. a donk

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Villain is very bad. Extremely aggressive, he fires at least one barrel if you check it to him usually. We played 2500nl and I stacked him twice, he wanted to move up and I obliged. He has two-barrel donked into me a couple times, once my draw missed and his AQ high was good and the other his K4 club draw missed and my second pair was good.

First thing, how is my river bet? He's capable of looking me up light but after I made a few smallish value bets (most of this was at 10/25, this hand is probably about 30 hands into our 25/50 match) he started folding more to 1/2 to 2/3 sized bets. IMO mashing pot here is too suspicious as the only time I've done it with second nut flush he snapcalled with small two pair and mucked.

I bet with the intention of calling a shove. I believe he is capable of c/r bluffing here because he's getting a little frustrated, has shown hints of such in the chat. (Some "lol" remarks after a few hands and a “jeez” or two)

Ultimate Bet No-Limit Hold'em, $50 BB (2 handed) Hand History converter Courtesy of PokerZion.com

Hero ($6997.75)
BB <font color="#A500AF">(Villain)</font> ($7643.25)

Preflop: Hero is Button with A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to $150</font>, BB <font color="#A500AF">(Villain)</font> calls $100.

Flop: ($300) 3[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Villain bets $250</font>, Hero calls $250.

Turn: ($800) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Villain bets $800</font>, Hero calls $800.

River: ($2400) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Villain checks, <font color="#CC3333">Hero bets $2000</font>, <font color="#CC3333">Villain raises to $6443.25 (All-In)</font>.

Final Pot: $14641