[Radical Pi]

I'm a C++ programmer, so I can't give you too many specifics on how to do this in Labview, but once you have opened the jaguar, there is a vi called CAN Jaguar Get Status.vi which includes the current running through the jag even if you aren't in current control mode (well, the C++ equivalent works out of current control, so LV probably does too). Once you have that you can change your levels as needed.

Alternatively, you can use current control mode to set the current that should be passing through the jaguar, which could be combined with a PID loop on the cRIO to make up for the loss of speed control.