I updated the first post to clarify version info, and to add info on how to use 3.4.2, plus a sample config file for those that are completely new.
I switched to 3.4.2 and it was about as seamless as it could get. I had two machines configured identically, complete with UART and USB drivers. One had all my erupters, the other had none. So I removed the UART driver from the one without erupters, rebooted, put cgminer 3.4.2 in a new folder, made a new script to start cgminer, and plugged all my erupters in. I did one hub at a time to make sure it worked, and it worked. No more COM port madness.
I think I'm getting 335MH/s per device now, compared to 333, and I think my hardware errors are lower. I checked to see what I had on the old machine, and I think I was running around 7%, but I may have had an error in my math. I'm running about 1.2% with 3.4.2.
M