the guy is running 25/19 with a 3b of 5.9 over 347 hands

Standard spot to defend pf? Standard float on the flop? I might as well shove the turn since I'm pot committed after a call, but I didn't do the math for it during the hand.

Full Tilt No-Limit Hold'em, $1.00 BB (6 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

MP ($200)
CO ($128.95)
Hero (Button) ($140.95)
SB ($63.90)
BB ($221.30)
UTG ($100)

Preflop: Hero is Button with J, K
3 folds, Hero bets $2.50, SB calls $2, BB raises to $13, Hero calls $10.50, 1 fold

Flop: ($28.50) 8, 4, 6 (2 players)
BB bets $22, Hero calls $22

Turn: ($72.50) K (2 players)
BB bets $40, Hero calls $40

River: ($152.50) 8 (2 players)
BB bets $146.30 (All-In), Hero calls $65.95 (All-In)

Total pot: $284.40 | Rake: $3