ive always been very pickey about having clean cable routing on all my bikes. my current one has been troublesome however. i am starting to think its a combination of the parts used and i am going to have to live with it. if i leave enough cable to not restrict the steering the cables rub the stem of all things. the rubbing is not a huge deal but it does give the bike "self correcting" steering

setup:
130mm stem (very large diameter)
one 5mm spacer under the stem.
wing shape bars with no tape on the top
campagnolo levers (shift cables crossed)
tall head tube

the cable was originally cut with a 10mm spacer under the stem so that explains some of the rubbing but not all of it. right now the rear brake cable is VERY tight when the bars are turned, but when the bars are straight, it rubs the bottom of the stem.

it would make sense that the long stem requires extra cable that has "no where to go" when the bars are turned. my "vintage" ride is set up with relatively the same fit, but i think the lower head tube and much thinner stem (half as thick) stem let me get by with it.

any advice?

only pic i have of the afflicted bike. you can kinda see the red housing hitting the clamp:


"vintage" ride with almost identical reach, saddle drop, and cable routing method (clean routing/no rubbing)