Logging removal works, the serial port works about the same, FTDI still does not work right but I really think this may be in FTDI setup may be, on windows if you check FTDI cables, in device manager it has setting that effect on it perform and how often it may create usb interrupt to read, and if that setting is set to 16 msec, it does the same in windows becomes very choppy. so may be check there and see if there are any init setting for this device.
For now I have at least one device that works great. so I am Ok, I have to see how I can help you to fix this and if there is even a fix.
Thanks,
Mostafa