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My first guess would be bends in the cable, last run to the rb is very common to be too sharp a bend. And first run to gears would also suggest it's not gunk, or wouldn't you get the gunk either both in the end runs or start runs not one of each? Obviously bullshit Internet diagnosis by someone that doesn't really know that much, just loud mouthed and contrary... But something doesn't add up...
@Howard, I've always heard the arguements for using cable stops is because the frame is more compression resistant than cable (at least old cable, not so certain about compressionless) and also less friction with air than outer! Rather than weight. But you are Defo right more cuts gives more opportunity for bad cuts/wrong length outers... Worth considering. Cheers for answering all my questions.
Yeah, it's weird. The last run to the rd and first run to the rb were the problem.