The problem is, from center to 7/8 nothing happens, then lock track, then superspin. Its so touchy its almost impossible to avoid superspin.
I was thinking I should have more control of the steering around the center of the stick.
I suggest you check your radio transmitter/receiver setup. It's easy to do if you have a spare servo. Just unplug the rudder lead (don't worry if the tank shuts off, the rudder lead does that) from the DMD, and plug in the servo. Then move the steering stick left and right smoothly and slowly. Servo should move smoothly and slowly, just like the stick movement. It might be a signal that is 0 until you get full deflection. . It may not be an issue, but it's a low cost thing to check prior to buying more hardware (although maybe not as much fun!)