im about to use up the last of my 70D silnylon from the last time you carried it. Really awesome stuff, it's a very versatile fabric.
If you could find some, a 1.1 base nylon with a .4 or .5oz silicone coating would be awesome for applications where more waterproofness under pressure is desired, but weight is still paramount. I think it could do a great job replacing the 1.3 silnylon all together because of its increased waterproofness. It would be ideal for bivy bottoms, UL pack panels, no-mist tarps, stuff sacks and ground sheets.
BTW, Do you have any plans to carry any more of that 6' wide silnylon any time soon?