I use to read the testing done by Paulus and others...their testing is a good reference because of the games manufacturers play.
Lines labeled "Class Strength" are manufactured to break EXACTLY at the printed weight for competition and Record fishing...Lines labeled "Test" are manufactured to break at the MINIMUM printed on the package.
Companies continue to use "Pound Test" because that's how Mono was always marketed and they can confuse fishermen with the different tactics they use....the proper way of labeling braid or Superlines would be in the correct diameter of Mono and Class Strength...Pure Fishing continues to market their lines at a smaller "Test" even though their lines need to be in a much larger diameter class....Of Course, there is no upside to Pure Fishing to advertise their lines correctly...they want to tout that our lines break at a higher test but they don't want to put that line in the proper categories because of all the other drawbacks their lines have. Why would Pure Fishing market a 10lb Fireline, that is a little larger than a 20lb pound braid, and both break close to the same "Test"...because that is the only thing that their line has going for it....it is stiff, does not cast as far, digs into itself because it is flat, etc, etc, etc.
As I said before, Smackdown is the best overall braid that I have used so far, and it seems that it is rated just about right as a "Class Strength" line....but that's just my opinion!
Oh, and to improve on your superline knots, start a Palomar knot but wrap it twice through the eye, then finish the Palomar...it also cushions and improves knot strength...and it has been tested too!