Is this bluff too much? When villain bets HP on this turn I believe he is betting a weaker pair that will fold in some spots. Villain has a turn and river bet of 50-60% so I think I won't get to show down easily if I call the turn and there are some holdings like AK, weak pairs, and bluffs I can get to fold.

I could see villain doing this with a lot of Ax like A5s+, A9o+, 66, 77, KT/s, K9s, Q9s, QT/s.
I thought that with the nut flush blocker and a blocker to some QJ I could represent a straight and fold out some weaker holdings that would bet HP on the hand. The only issue I could see is that with hands like Q9 and QT he also has a blocker that is relevant and could potentially hero call, however I think those hands are too weak to call a river jam.

I think this board works well for my range, but I'm not sure if I should be bluffing with AJ here. Maybe I should only be bluffing with AJs in this spot instead.

Hero (SB) ($26.61)
BB ($21.48)
UTG ($19.80)
MP ($21.01)
CO ($31.57)
Button ($24.47)

Preflop: Hero is SB with As, Jh
1 fold, MP raises $0.70, 1 fold, Button calls $0.70, Hero calls $0.60, 1 fold

Flop: ($2.30) 4s, 8s, 9c (3 players)
Hero checks, MP bets $0.95, 1 fold, Hero calls $0.95

Turn: ($4.20) 10c (2 players)
Hero checks, MP bets $2.10, Hero raises $6.50, MP calls $4.40

River: ($17.20) 6d (2 players)
Hero bets $18.46 (All-In), MP calls $12.86 (All-In)

Total pot: $42.92