villain was playin 30/20 with 6.8% 3bet and generally seemed competent and loose aggressive... preflop i guess is standard... on the flop should i cbet once he checks to me as the pfr? and cbet bigger than i did? on the turn when i have an openender for some more outs what do u think of the doublebarrel? and finally on the river should i just give up or fire the 3rd bullet given he just check called all the way and his range should be weak? also qwhat about my sizing?