Cow....before you change your chassis setup...decrease the amount of brake you have programmed. Depending on equipment ,you can do this at the radio or the ESC. Chances are it will be easier at the radio. The problem is simple.With a one way,the front axle is coasting when you let off the throttle or apply brakes.Unlike the ball diff which would actually be braking along with your rear diff. With only the back braking at the same setting you had before, it's skidding. You'll notice this particularly when you apply brakes at the entrance to a turn.
The Mission is a great chassis but i haven't run 1 in awhile. Consult the Schumacher thread for setup advice with the 1 way.