OMAPoker

I just played this hand in a $2.20 buy in tournament. I'm posting it here looking for some advice as I think I often make mistakes in very similar situations:

6 handed, 42bb effective. No reads on any of the players at the table as I just moved to a new table.

Blinds 20/40, no antes

Action folds round to Hero (1680) in the CO, who raises to 80. Button folds, small blind (2400) calls, big blind folds

Flop (200): Kd 2d 9s -> Small blind checks, Hero bets 100, small blind calls.

Turn (400): Qs -> Small blind checks, Hero bets 300, small blind calls

River (1000): Ks -> Small blind checks, Hero jams for remaining 1280.

Small blind calls and shows As2s

My thought process:

Pre: Raising pre is mandatory with AhKh

Flop: A clear value bet vs small blind who will call with worse Kx, 9x, some diamond draws and some JT type hands

Turn: Not a great turn if small blind called flop with Kx or JT, but I still felt like there was some value to be had, so I decided to bet. Small blind just calls, and I would expect him to raise any straights/two pair combos, so I assumed I was still ahead.

River: I wasn't sure whether to love or hate this river. On one hand, if SB has called flop and turn with worse Kx, we can probably get max value. However, I now realise that he has very few combos of Kx left on this river. I thought most flush draws he called flop and turn with would be diamonds, so I wasn't too worried about spades (maybe I should have been).

I think this is a situation which I commonly misplay. I'm not sure if I'm over-repping my hand. Jamming 1.2x pot on river definitely felt awkward. Any advice welcome!