Shouldn't be any issue with any ammo, but I've not shot Maxxtech. Can you get your hands on some 124 or 147 gr? You can check the buffer but it, most likely, is not chewed up yet. It should be good for a few thousand rounds, and the need for it is debated all over the place, but it is recommended by CZ.
How does the slide feel when you rack it without a mag? If smooth and easy, is there any chance you are having a mag issue? Still puzzled here because I've never even heard of a TSO that hasn't been modded not running right. You can toss this out to the issues forum and see what others have to say.