change back to MME driver mode.

what do you need to make them work properly with no latency (or so little). An external Soundcard on which you plug the USB mic?

 
Since they need MME drivers to operate, there is really no way to get latency down to acceptable levels
As far as I know, there is no external interface that can accept an input from a USB mic
And if you bought an external interface, you would still be using 2 sound cards (the mic and the interface), each with it's own clock and there is no way to synchronize them. The more tracks you would record with the USB mic, the more out-of-sync the tracks would get.

USB mics are very hard to get to work properly with MC and Sonar in general.  Not that Sonar or the USB mic is a bad thing.... it's just that they are from two different worlds in how they work and making them work together is nearly impossible.

USB mics are good for podcasting and recording stuff into the computer using it's Microsoft recorder...and that's about the extent of the usefulness of a USB mic.

Cake products were designed to record multitrack music and use ONE sound card which is capable of handling the whole process. When you use a USB mic, you are essentially using TWO sound cards which are NOT synced together with timing signals, so things you record will drift out of time quite often, and the factory card is not capable of delivering a low latency experience. That combination of misadventures is what causes the problems for even the best and most experienced users trying to get a USB mic to work. 

The best option is to return the USB mic, use the store credit to purchase something like a USB based M-Audio, Presonus, or Focusrite music interface with midi & audio in one box, which uses ASIO drivers and then, plug in a "normal" dynamic or condenser mic to the interface...... that is the combination that most people here use, and it works well, with very low latency.