I think 1200 on the turn is the smallest you can go to get the chips in on the river, but you may want to think a little about what is calling you here to adjust your sizing. I think the most likely hands that are in that range that are going to be calling you here are straight draws and flush draws. On the flop I am not as worried about the FD here are you have the Ac blocker, but when the turn bricks those, I don't want another club to come. I would push harder on the flop and turn as it is very likely that if neither of the draws hits you are going to lose any value on the river so I really like setting up the shove on the river, but just be prepared to not have it called if it is a brick. Based on my assumptions I would bet harder on the flop and turn. These types of players are attached to drawing out on you and give up when they miss so I would make every effort to punish them while they are inclined to play along.  Just my thoughts for what its worth.