Once I got the cable issue straightened out things started to come together. I was actually able to run through some demo Gcode programs I had made and so far what I'm seeing is impressive. I've been slowly stepping up the velocity/acceleration values and I noticed something odd:

(This is with KMotionCNC by the way)

The G0 moves are really, really slow and the G1 moves are fast. That doesn't seem right. I'm a bit of a CNC newbie, so is this sometime that's wrong in how I setup my gcode file or did I miss a setting in KMotionCNC somewhere?