Cool. I think you may have been expecting too much from the RnW. I use it with the OmniBlock 2.6 like you're doing, with the RnW used as a redirect. I tried it with the Stein RC-1000, too! More than one wrap, in my opinion, is getting to the limits of the ropes it will work well with. It just feels wrong to me. But, I like getting very long service out of a rope and when I get that feeling that things are getting close to the rope's limit, I just switch to the 5/8" setup and the Stein RC-2000.
This coming spring, I want to try a 3-strand, 1/2" rope with the RnW setup. Mostly curiosity on how the friction changes, but 3-strand ropes are cheap. Not as strong, but handle abrasion better, so a trashed rope doesn't hurt the old First National of Billfold as bad. I'm thinking, if I break this 6,000 MBS rope, I just found the limit for my 1/2" RnW setup, and if I know this limit and stay under it, I'm not going to break a 7,000 MBS rope, right?