Thanks to Spoons prodding I've been trying to work on my bet sizing and maximizing value. This hand represents a type of spot that I'm having trouble with. Villain is 21/21/7 over 28 hands. With his PF 3bet I'm putting his range on 99+ AQs+ AK and potentially QJs and KQs though I'm discounting those. Against the tighter range my equity on the flop is 73.5%. So I'm happy with the flop but torn on what type of line to take especially since his range will include some flush draws and possible straight draws. Flatting his flop bet would obviously be bad but what size do I raise to to get the scarier portions of his range to fold while keeping the weaker portions in. Do I even feel comfortable seeing another card here?

$0.02/$0.05 No Limit Holdem
FullTiltPoker
6 Players
Hand Conversion Powered by weaktight.com

Stacks:
UTG exarace ($3.45)
UTG+1 bubbamugs ($3.75)
CO zilitan ($5.53)
BTN argash ($5.41)
SB hardwoodfloors ($9.13)
BB GeminiRooster ($5)

Pre-Flop: ($0.07, 6 players) argash is BTN
3 folds, argash raises to $0.15, hardwoodfloors calls $0.13, GeminiRooster raises to $0.55, argash calls $0.40, hardwoodfloors folds

Flop: ($1.25, 2 players)
GeminiRooster bets $0.70, $0.7 to argash ($4.86)?