Made a deep run in a 10+1 today, running through and analyzing a few spots. Sometimes I struggle with bet sizing on the turn with a made but vulnerable hand. Any thoughts on this would be appreciated. This hand is from early on, Villain is 50/50/0 10 hands in

Winning Poker Network (Yatahay) - 20/40 NL - Holdem - 9 players
Hand converted by PokerTracker 4: http://www.pokertracker.com

SB: 141.65 BB (VPIP: 30.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 10)
BB: 74.25 BB (VPIP: 50.00, PFR: 50.00, 3Bet Preflop: 50.00, Hands: 10)
UTG: 182.85 BB (VPIP: 25.45, PFR: 18.52, 3Bet Preflop: 5.88, Hands: 56)
UTG+1: 121.63 BB (VPIP: 11.76, PFR: 5.88, 3Bet Preflop: 0.00, Hands: 17)
MP: 51.33 BB (VPIP: 22.22, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 9)
MP+1: 197.05 BB (VPIP: 22.45, PFR: 14.29, 3Bet Preflop: 10.00, Hands: 49)
MP+2: 94.65 BB (VPIP: 33.33, PFR: 33.33, 3Bet Preflop: 0.00, Hands: 9)
Hero (CO): 225.85 BB
BTN: 129.23 BB (VPIP: 18.18, PFR: 9.09, 3Bet Preflop: 0.00, Hands: 11)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 7d 7h
fold, fold, fold, fold, fold, Hero raises to 3 BB, fold, fold, BB calls 2 BB

Flop : (6.5 BB, 2 players) 6s 4d 5c
BB checks, Hero bets 3.25 BB, BB calls 3.25 BB

Turn : (13 BB, 2 players) 8c
BB bets 8.68 BB, Hero raises to ???

I'm thinking 20BB's sets up a river shove here...too big?