You must first bear in mind that flux cored gas-less wire does give off a lot more spatter & fumes than gas shielded wire. "Spitting" could be caused by all kinds of problems, simply by being too far away from the job (1/4" away is ideal), too much wire feed speed, blocked torch lining, worn contact tip, a bad earth connection or a combination of them all.
Post us some pictures of a test run if you can.
weldequip