ya, I was under the impression that if the snubber is adjusted too close to the floor you'll loose suspension travel... this is fine if it a race car only but, if it is to be street driven then the snubber can't be so close and that's when you'll need that 1/4" plate.. I guess this is silly too if you are using an adjustable snubber... move it up/down depending on the driving you are doing... hello!
I had a snubber in my car for a minute. It made the car ride worse than with Caltracs. Took it out and went with slapper bars. It rides great, handles well and hooks hard.