Villain steal is 48% / call 3bet after raise is 43% / Cbet 62% / fold to Cbet 64%

Do we like flatting or 3betting in this spot?

Once we 3bet do we like Cbetting flop and to what size?

PokerStars - 25/50 Ante 6 NL - Holdem - 9 players
Hand converted by PokerTracker 4

MP+2: 2,899 (VPIP: 18.02, PFR: 15.06, 3Bet Preflop: 9.94, Hands: 519)
CO: 2,779 (VPIP: 30.31, PFR: 21.86, 3Bet Preflop: 6.25, Hands: 289)
Hero (BTN): 3,149
SB: 3,264 (VPIP: 40.00, PFR: 10.00, 3Bet Preflop: 0.00, Hands: 11)
BB: 1,297 (VPIP: 15.44, PFR: 13.90, 3Bet Preflop: 5.67, Hands: 1,247)
UTG: 4,653 (VPIP: 18.44, PFR: 15.53, 3Bet Preflop: 7.29, Hands: 901)
UTG+1: 1,412 (VPIP: 20.10, PFR: 13.88, 3Bet Preflop: 6.00, Hands: 418)
MP: 5,688 (VPIP: 19.25, PFR: 16.08, 3Bet Preflop: 7.89, Hands: 378)
MP+1: 1,859 (VPIP: 17.27, PFR: 15.06, 3Bet Preflop: 5.17, Hands: 2,655)

9 players post ante of 6, SB posts SB 25, BB posts BB 50

Pre Flop: (pot: 129) Hero has J Q

fold, fold, fold, fold, fold, CO raises to 150, Hero raises to 350, fold, fold, CO calls 200

Flop: (829, 2 players) 5 9 6
CO checks, [color=red]Hero ?

IMO 3-bet is totally fine, the sizing could be bigger though : 450 or something
I would c-bet 50-60% on the flop and if he called, then continue betting with non spade K, Q, J, T, 8 on the turn.