The solution is too simple.
Cut the straddle as short as possible. The problem is that the rear brake has low profile arms to ensure heel clearance.
If you look at the photo, you'll see that the cable is pulling the arm upward, while it's direction of movement is inward. Shortening the yoke cable will have it meet the arms at right angles, at the critical point where the shoe is engaging.
BRW - the front yoke cable is also too long, but since you're happy with it, you can leave it alone.
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FB
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Last edited by FBinNY; 06-18-17 at 09:22 PM.