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@Mr_Bump
Many older frames had outer gear cables running under the bottom bracket shell but yeah those brake cables create a compression effect you don't actually want, sort out some straight strand gear outers and bang on some ferules
Given the retro friction action the power shifters are perfect in a way as they'll shift any amount of gears so small imperfections in set up shouldn't cause any problem.
Also if there is room and you can handle the reverse action shifting the gears revolve the band 180 degrees, not sure it'll help but it's a thought.