Optimised New Solution 2. If you're reading this, that means I couldn't beat my Day 1 stake in the ground. 

I found the path from final bond to output a massive pain. I look forward to seeing how the actually good solves handle this.

10R is surely possible given there's space for a whole ass Arm 10 in 11R, but I don't think 9R can be done. I will eat a cow if theory min 8.4R is possible.