I suggest not changing charging handles or any other parts until you fix the issues you are having. If you make one change at a time, it is easier to solve the problem. I might get one failure, of any sort, every 10 magazines or so. Most deal with the nature of the rimfire round itself not always wanting to go bang. My go to ammo is CCI standard velocity or Norma Tac-22.

As stated, I'd start with changing out the extractor, assuming you haven't bent the ejector by messing with it or snagging it while cleaning. I put a straw over mine before running the bore snake down the barrel.

Also, make sure you are loading your magazines properly so that the rounds stagger. My technique is to pull down on the load assist button after each round and then let it snap back. I strongly suggest you browse thru the past discussions, especially ones dealing with failures & proper cleaning. Lots of good info here.

__________________
FIDELITAS ET FORTITUDO