I know that it's messy but I did it in a hurry to finish before the Euro raod trip to the Ring. The route and couplings for the pipes are to incorporate the original breather pipes, in case I need to revert back to the original breather system during the trip. If I can source some 30mm I/D black, single ply pvc hose then I'll re-do the pipework and it should look far neater. The 3 ply silicone is rather bulky!
So at 5600 miles, following a valve clean, I'll begin to monitor the catch-can contents. I know that opinion varies as to the cause of the carbon build-up, valve overlap being the most likely, but for my own peace of mind I've at least tried something. We'll see how it goes.........
