Nick, This sounds real good.
I am not all that familiar with sewing or bonding, so for me, and others here, I was wondering if you could give us any specifics. This might easily fall under a "trade secret" type ethic, though. Please do not violate that.
A triple step stitch? Not really following that term. I am more of a carpenter, cabinetmaker. Though in early years I did a lot of everything and anything to make money. I assume that you refer to the boxes caused by the reinforcment gridding in the fabric. Hard to know exactly what you mean, soo, refering to the grid on the fabric:
Triple step stitch:
1)needle, open box, needle (3 boxes forming one stitch?)
2)needle, 2 open boxes, needle (3 boxes forming the period of each stitch?)
3)needle, 3 open boxes, needle (3 boxes between each thread attachment?)
I know, I know...my total inexperience with seaming is showing...carpenters, sheeish!
"The seems contain both 3m (9485) double sided tape and sewing." I am assuming there is nothing special about the glue tape, cuben fiber, stitching setup. Example: A half lap and roll might give better resilts, or something different? A rough sketch: