When I was still fishing some dry flies and single nymphs I had taken to liking the Dai Riki tippet or Rio products. I thought the Dai Riki was the most supple and when you have to go to 7X supple is good. It always seemed strong too.
When I fished with 6 - 7 and even 8X leader tippets I used 'Shock Butt' material in my leaders. Shock tippet, believe it or not I still have a bunch, is a very strong clear nylon / rubber product with great elasticity, What you do is either fix a section about 1' either at the butt of the leader or integrate it into the line to leader connection. The idea is that when a fish makes that sudden lunge on a light line, the one which will break a 7X tippet knot; your leader butt comes to the rescue by adding just a little more shock absorption into the chain of command.
Lets face it, fly fishermen often times over think things, they love the intrigue of a new gadget or system, and you're thinking about shock tippets right now aren't you
I may seem set in my ways now, stubborn and unflinching as fad after fad, wave after wave, of new fangled ways to catch some poor fish come along, but there was a time when I was trying to solve some of life's little problems............... Problems like an 18" brown trout showing up where you never figured on that happening and then sucking in your size 20 Little Blue Quill. Yep, Shock Tippet in my leader butts
BTW, I mailed your package and will PM tracking number to you.