Prolly had the same issue. It's what happens when you use stupid Paul cable brakes.
You'll have the same issue with any mechanical caliper and a lot of hydraulic calipers.
If you move the mounts outside of the rear triangle you'll have to run the cable/hydraulic line over the seatstay instead of the chainstay.
@JB started
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Prolly had the same issue. It's what happens when you use stupid Paul cable brakes.