Just a few thoughts of things to try:
First off check your torch cable and nozzle, hold it out in a straight line and see if it feeds more consistently, even slightly rusty wire and other crap can contaminate the tube restricting the wire feed. Check/replace the nozzle.
The wire runs through rollers, one of which is normally reversible depending on which wire size your using, double check its correctly orientated.
Wire tension; sometimes the tensioner can be a little weak, a little packing on the tensioner can sometimes help.
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