Mick,
I do not understand why you wouild need ten different samples to prevent skew. If you quality control is good, i.e. all knives are ground to about the same measurements, you make your knives with the same quality of components, the heat treat is proper and consistent, etc. A high degree of quality control, where all knives are built to the same high standards prevents skew, not multiple samples.
While there may be very minor variations, the effect should be harmless. One knife should not pass with flying colors where another would suffer gross failure. That is my understanding of the essence of quality control.
It sounds like the demonstrations you did were not the same as the tests Cliff performed. If that is the case, were the results of Cliff's tests the expected behavior for your product, i.e. if the primary edge is hacked into concrete, is it expected that it will fail? What are the expected limits of your knives?
I am sure you have broekn many knives in your shop in Researching and design stages, as well as just to check heat treat and QC. At what point do they break, and how extreme can they be safely used?
I ask this because if your knives are designed to be used in the direst of circumstances, that would probably be a bad time to find out what the knife's limits are in my opinion. I am sure soliders test fire their weapopns before carrying them in the field, both to test the weapon and gain familiarity with it. Shouldn't the same be done with a knife?
If so, there is nothing wrong with that, it is the expected result, no suprise, no need to get upset. If somone note that my Jeep Wrangler can not go 150MPH, I would agree and point out that such performance is not within its intended scope of use or performance envelope.
If The failure shown in the test wasnot the expected result, then perhaps there was a flaw in the steel or heat treat. Have you examined the broken knife to see if this is the case? If not, would you be interested in doing that?
Did you ask Cliff to test your knife as he implies, or otherwise support or endorse his testing when you found he planned on doing so? Did you communicate with him via email or phone as to the expeced performance and durability of your knives? If so, would you be as upset by his methods if your knife pased with flying colors?
Obviously tightly controlled, standardized testing would be excellent, and as a consumer I would love to see the results. However, it could be very expensive, certainly beyond the means of a hobbiest reviewer.
I am not trying to start any problems,these just seem like logical questions to me.
I respect the fact that you cater to the specific needs of our troops, as well as your personal service to insure the safety of our great country, please do not feel I am trying to attack or dimish you in any way.
Your company has lots of very satisfied and loyal customers, many who I am sure use their knives in the most stressful ways under the worst of circumstances. You must be doing something right to have earned their loyalty and trust, such as building a high quality knife, backing it up all the way and providing excellent customer service. This has all been reported here and on other forums.
I would not try to insult you because it is not my nature, I try to be very polite. Also, I am scared that if I did you would track me and smash my face in with a hammer.

Seriously, I don't make personal attacks and I don't like them made towards me.
Thank you for your time and consideration in replying to my questions.
KT