Hero is playing snug. TAG AND fairly card dead. Did stack a weak villain with AK over KQ on K high flop in the last 1/2 hour.

Villain is OWG, not afraid to mix it up and plays TAG post flop with loose passive preflop tendencies.

OTTH $1-2 NL - effective $600 stacks

Hero raises to 12 Utg with A K
Finds to villain in CO who calls
Blinds fold.

Flop ($27)
A K 9

Hero leads for $16. I am going to lead 100% of my utg raising range in this situation for about 1/2 pot.

Villain calls.

Turn($59) J

Hero bets $35. Clearly my sizing us too small here. In hindsight I go for 55 to charge draws and value worse A and 2pair.

Villain calls.

River ($129) 8

Hero leads for 60
Villain raises to 200

Hero? My thinking was that I can still value 2 pair hands and bet fold to raises. But I'm pretty near the top of my range here and have underrepped my hand I think.

You have put in aggression on every street. Trust me, you have not "underrepped" your hand. Probably the only worse hand you'd take this line for value with would be AJ, and maybe only suited combos due to preflop position. This is a good time to find a bet/fold.