Compressionless housing is not really primarily meant to reduce friction, but to act as less of a 'spring' along its length so brakes have a more rigid connection to the lever. If you feel roughness or friction, those are usually caused by housing that is dirty, kinked, or has a mangled coil at one end interfering with the inner cable, or a kinked or frayed wire in the inner cable. It is likely replacing the inner cable and cable housing with any lined housing will improve brake feel as long as it is properly cut and the ends finished correctly. Compressionless housing will give a bit crisper brake feel but I believe is of limited benefit to actual braking. Others may have a different perspective.