2/5 game. Villain has played one orbit. During the orbit he played a single hand where he isolated a MP limper and triple-barreled Qx 6x 6x Tx Ax and showed AQs.

Effective stacks are $800.

BTN straddle for $10. Hero in HJ, villain to my immediate right.

Folded around to Villain who opens to $40. Hero 3b to $120 with Td Th. Folded around to villain who calls.

Flop ($255): Ah 7c 6d

Villain checks. Hero bets $50. Villain calls. (In hindsight, this was probably a mistake and I should have bet something closer to 1/2 pot).

Turn: ($355): 8h

Villain leads for $200

Hero: ???

All feedback would be appreciated on flop sizing, preflop decision to 3b, etc.