Hoot- I'd love to hear more about your descent. Moss has the same question as I: what climbing line are you using, and what line were you using as the split tail?
I think I'm not envisioning what you are talking about right, because what I'm picturing from your explanation makes it sounds like you lucked out big time and were only a slight distance from a scary accident.
I've toyed with the Blakes on SRT and found that I could make it work with 1/2" vectran double buried on what I think was a 5/4 Blakes (it was a long time ago, so I don't remember for sure). I found that when I changed any one variable, the system would either slide uncontrollably or lock up beyond use.
So did you get to see the nice views through the binocs? And WELCOME TO THE SITE!!!!
love
nick