It seems you have things just about exactly backwards. Most fluxcore wires operate in a spray transfer type mode = no bacon sounds. Short arc mig - bare wire, low volts and low wire speed = bacon sound. Not all fluxcore wires run on DCEN, about half of them run on DCEP, check with your supplier or post the wire you are using here. The problem you are having with your bare wire is probably porosity. Check your gas flow rate, slow down your travel speed, clean your material better and pay attention to your electrode angle. Too severe of an angle will create a venturi effect and pull atmosphere into your molten puddle. Too fast of travel speed will not allow gases to escape.
Mike Sherman