Samuel, I'm interested in the balloon cloth. I'm looking forward to hearing how it perfoems in HH tests, especially for samples that have been abraded. Silicone coatings are less abrasion resistant than urethanes, and a pack will be in the abraded state for 95% of the time that a person owns it. So the post-abrasion HH is the more important number in my opinion.
Also, tenacity before and after abrasion would be interesting. If you have a piece of rebar, you could pull HEMMED strips of balloon cloth and HEMMED strips of other coated nylons (sil and urethane, DP laminates, cuben) over it a standardized number of times under a known load (hang a weight from one end and pull down on the other end). Then you could hang the strips and load them to failure to measure the tenacity. This is similar to the abrasion tests often done in the textiles industry.
Doing a battery of tests is a lot of work and very time consuming, but if the fabric performs really well, it could be a great option for MYOG packs, gaiters, groundcloths, bivy bottoms, and other articles requiring a medium-weight material.