Are you game for testing the ASIO drivers for the Rock Frog?
I am not directly familiar with the unit, but can offer general instructions. Most of this stuff follows similar protocol.
If it doesn't work, you can change it back, and try WDM.
There is another alternative, ASIO4All, which wraps the WDM drivers, and can make them perform better.
However, if a device has native ASIO drivers, it is generally best to use those.