About the color catchers, depending on what your washing sometimes you need to use TWO. At least that's what they told me when one outfit ran all over my brand new towels.
When I prewash I always wash the new fabrics by themselves in color groups. Blues together for instance. Thousands of bolts tells you not to wash them together, but sometimes I feel a little blending of the "blues" for instance, all going into the same quilt wouldn't hurt.
And last thing, my mom swears by putting a cup of vinegar for prewashing and then later into the load with a new quilt.