Hi,
V's pfr is 34% and limps another 34%, 3b% is 9 and calls 36% preflop so didn't seem extremely aggro preflop. However, whenever V was in a pot postflop, V became rly aggro: donking / stabbing whenever V sensed weakness. So i decided to try to CR him to stop bullying me... Couple of hands b4, i CR his stab w K2cc on 34cc9A turn and barreled another A OTR to which V folded.
Here i wanted to do sth similar but maybe my flop CR is too small. I picked up equity OTT so i thought another bet is ok there. But i got lost OTR though 3h completes some draws, not sure that i can make V fold with a 3rd bet @ this level...

Full Tilt No-Limit Hold'em Tournament, 20/40 Blinds (2 handed) - Full Tilt Converter Tool from http://www.flopturnriver.com/

Hero (BB) (t1,400)
SB (t1,600)

Preflop: Hero is BB with 5, 9
SB calls t20, Hero checks

Flop: (t80) 4, 7, 8 (2 players)
Hero checks, SB bets t40, Hero raises t80, SB calls t40

Turn: (t240) J (2 players)
Hero bets t120, SB calls t120

River: (t480) 3 (2 players)
Hero ??
Total pot: t480

Yea flop c/r is way too small, he's not folding anything other than 23 to that c/r, needs to be at least 120.

Turn I would size bigger, 2/3 - 3/4 pot in hopes of folding out his 7x & 4x.

River is most likely a c/f unless you have a read that he would play his flush draws more aggressively otf/turn

Against a aggro player early in the game then I would be probably folding this hand pre flop OOP, or if I did play it then I would be making a small PFR in order to take the initiative in the hand.

The CR on the flop is to small and as played I would just call the flop.

how about calling flop and betting turn? this line works well vs villains that go around making bets every time they can imo