3/6nl 6max - playing medium pairs

[polyviewness]

$3/$6 Blinds No Limit Hold'em
Table "[censored] lags" (Real Money)
Seat 4 is the button
Total number of players : 6
Seat 4: Hero Button ( $867.53 )
Seat 5: SB ( $599.25 )
Seat 6: BB ( $205.4 )
Seat 7: UTG ( $252.8 )
Seat 8: Hijack ( $478.67 )
Seat 9: CO ( $617 )
SB posts [$3].
BB posts [$6].
** Dealing down cards **
Dealt to Hero [ Jd Jh ]
UTG calls [$6].
Hijack folds.
CO raises [$28].
Hero raises [$97].
SB folds.
BB folds.
UTG folds.
CO calls [$69].
** Dealing Flop ** [ 3d, 3c, 9s ]
CO checks.
Hero checks.
** Dealing Turn ** [ Ac ]
CO bets [$145].
Hero folds.
** Summary **
CO collected [$350].

[polyviewness]

CO plays 24/17 over large sample size and is a big winner in database, we tangle a lot, and he often shows down air. He is capable of EVERYTHING.

I play 26/19 and he knows my range here is pretty wide.

Is this too weak? Should I just be prepared to felt JJ in spots like this against players like him? Should I have c-bet the flop?

Lately I've been thinking I can show more value by just cold-calling with medium pairs and playing for set value in multi-way pots than trying to isolate big winning lags with them. I'm sure no one in the world can run as bad as me, but still, it seems everytime I either fold and feel weak or felt and lose.
"look for +EV spots, not spots where if 16 different questionable assumptions hold then maybe it stretches to a 0ev play"