Villain is marked as rec(not multi tabler, not playing much and etc), but table doesn't fill in so maybe he is not bad player

Flop I'm mixing, turn I think I'm pure betting(solver seems to agree with me). On the river I feel kinda marginal; compare to sims I expect average player to have stronger range and therefore less excited to bluff. Was trying to think bluffing range and everything except A4-A3,67 feels not happy to be bluffing. I plugged pio after and bit suprised at bluffing %

should I be bluffing there as pio? or actually checking those 33/A7s which have like 1bb as check behind.