Chainsaw Repair

On my craftsmen 2.0 I have to run it way rich on the L. To the point it won't run long just sitting before it loads up and stalls. About 20 seconds in fact. Its still not great to start though, maybe three pulls with choke, then one or two with it off. I've never found a sweet spot for this saw. I ported the muffler a while ago and it actually ran/started better, still not perfect though. I really don't like using it for anything other then branches and small stuff though. It has more then enough to pull the 16" bar, but constantly packs the filter with chips. Also gets it bad in the bar oiler area, to the extent it will stop the oil if not cleaned. It seems to take no time at all for this to happen.