Well, my EZ is back to its old ways of having the last live round not load and get caught in the ejection port. I even had a live last round completely eject from the gun a couple of times. My last range session had last round issues about 25% of the time.

I contacted S&W again today and this time they are sending new followers for all my magazines and a new recoil spring assembly. We'll see if that makes any difference. If not, the next step will be for them to replace all the magazines. They don't think it's the gun, but said if the mags/springs don't fix it, I should send it in... So, the process continues and their customer service has been excellent. (For the record, my round count is currently at 2400 and except for this last round issue, the gun has functioned flawlessly.)