[10NL] AJs...river raise too thin?

Villain is 34/24/6 (3bet) over 62 hands.

PokerStars - $0.10 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

Hero (BTN): $11.93
SB: $11.14
BB: $19.47
UTG: $9.70
MP: $7.18
CO: $29.90

SB posts SB $0.05, BB posts BB $0.10

Pre Flop: (pot: $0.15) Hero has A:spade: J:spade:

fold, MP raises to $0.30, fold, Hero calls $0.30, fold, fold

Flop: ($0.75, 2 players) 4:diamond: 3:heart: J:diamond:
MP bets $0.40, Hero calls $0.40

Turn: ($1.55, 2 players) 7:spade:
MP bets $0.80, Hero calls $0.80

River: ($3.15, 2 players) 4:heart:
MP bets $1.00, Hero raises to $3.25

Is this raise too thin, especially given the board paired? I figure I'm probably over-repping my hand here but I'm trying to focus on getting the maximum value out of my hands and I just don't think villain is gonna fold any Jx hand here on the river.

First of all, how much Jx does he have compared to stuff that beats us?

Second, I think this guy will find a fold pretty often with KJ and worse, unless you've been winning a few pots more than average at river without showdown. I want to see this guy call top pair to river raises before I'll start combo counting. I'm calling this river bet.

as played,call river.
i would raise/fold to shove turn

I feel like calling down and then raising river looks stronger than just raising flop. So if you don't think he's folding Jx here then he's really prob not folding flop?

I would raise flop. As played, I think it's a bit over-repping, I don't mind a smaller raise I guess. I would just call though 95% of the time.