If you are using a batting that is thin like Warm and Natural, it is difficult at best to avoid the "pokies" top or bottom side. I would suggest using a poly or poly/cotton blend. Also, using a polyester thread will be easier to accomplish using different thread colors.
Also, if you are using the machine as sit down machine, you may be moving your fabric too fast. If you are using it on a frame, you may be moving the machine too fast.
If you are getting railroad tracks or eyelash effect on back of the quilt, you are going around curves too fast. Just like driving a car, you must slow down on the curves.