UTG - $47.85
SB - $78.00 - Hero - KcQd

Preflop:
UTG raises to $1.75, SB 3bets to $5.75
*Is this too loose to 3bet or should I just fold? Vs an anonymous UTG, I would 3bet AQo/AKo. Probably flat AKs/AQs. Because I'm already 3betting AQ/AK, does that mean I don't need to add KQ because I would have too many 3bet bluffs relative to value?

Flop: 3c5h6d
Hero???
Should Hero c-bet here or c/f? Villain defending range is probably AQ/AK and QQ-99. Seems like villain isn't folding any of those on the flop and I should be checking to fold to a bet. Maybe because KQ is the worst hand in my range too (maybe AQ should be the worse hand).

Also, if your UTG villain facing a SB 3-bet, would you just sometimes flat AA and KK? If so, what frequency?