Braid strength question

[stevelikes2fish]

Not sure if this is the right place here, but, need help or opinions. Recently purchased some braid that I found online. A 30# and a 40# spool.I decided to test both strengths.
First, I peeled off approx. 3' of the 30# braid. I then placed a loop on both ends. Then I put the line through the loop around the handle and put a bucket on a calibrated floor scale and started filling it with weight. I placed my gloved hand through the other loop to lift the bucket of weight. When the bucket reached 18 pounds, the line snapped, right in the middle, not at the knots. I performed this test 3 more times for a total of 4 times. Each time the line broke right in the middle.
Next, I performed the same test using the 40# braid. Exact procedure. And each time the line broke in the exact same place, right at 22 pounds.
I have been e-mailing the manufacturer back and forth while receiving his emails stating that their lines are tested on machines which cost thousands of dollars and that my test is very inaccurate and even called a back yard test.
My question here, not being a professional or owning any professional testing machines, is my test considered a basic means of testing the line, or am I doing something wrong. I would appreciate all responses. I'm not looking to mock the manufacturer and I know about all the quality premium lines as I normally use JB or Momoi. All I'm looking for here is weather my test would be considered a good, simple way of testing the strength.
Thanks