I was having similar problems with my V2, but I can EQ it out with the built-in EQ. At first, I thought it was because the cabinet couldn't handle it, and that's partially true. Randall really pumps out the bass in their solid state amps.
Mesa cabs cut the bass well, but the Genz Benz G-Flex cabs really handle the bass!
Try this for fun...hook your amp up to bass guitar cab. Guess what happens?