Your patience and diligence will pay off.
I too have spent 2 days finalizing the rigging on my Pup. 3 wings are perfect; 1 still out of kilter.
Q: Did you ever finish the Sopwith Triplane?
P.S. I love your Snipe build thread. spend a few days reading it. Ashame that CD Designs no longer kits available. I may order the Replicraft plans from Jim Kiger this weekend for my future build.