I've been fighting the same battle, and finally I have to give up Behringer usb mixers. Tried two X1222USBs and almost tried an X1204USB.
My current solution is to buy a Behringer FX mixer (1002FX/1202FX or UBxxxxFX etc) plus a usb SoundBlaster. Actually I have been using this configuration for years and the result is pretty good.
I've been fighting the same battle, and finally I have to give up Behringer usb mixers. Tried two X1222USBs and almost tried an X1204USB.
My current solution is to buy a Behringer FX mixer (1002FX/1202FX or UBxxxxFX etc) plus a usb SoundBlaster. Actually I have been using this configuration for years and the result is pretty good.