Should I have folded flop into this board? UTG+1 has 13 postflop aggression factor over very small sample, so I thought a raise would get him outas I felt it was just a standard feeler bet. I am not worried about CO call, I expected it. I am not worried so much about results as much as I am wondering how dangerous flop raise on this board is, long term......

PokerRoom No-Limit Hold'em, $0.50 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($25.25)
UTG ($9.80)
UTG+1 ($18.50)
UTG+2 ($23.45)
MP1 ($8.05)
Hero ($27.05)
MP3 ($8.95)
CO ($5.35)
Button ($17.70)
SB ($18.55)

Preflop: Hero is MP2 with K, A.
UTG calls $0.25, UTG+1 calls $0.25, 2 folds, Hero raises to $1.25, 1 fold, CO calls $1.25, 3 folds, UTG folds, UTG+1 calls $1.

Flop: ($4.40) 8, 8, 7 (3 players)
UTG+1 bets $1, Hero raises to $5, CO calls $4.10 (All-In), UTG+1 folds.

Turn: ($14.50) 9 (2 players, 1 all-in)

River: ($14.50) 9 (2 players, 1 all-in)

Final Pot: $14.50