Unhappy with the performance of my SA 90MM Drum hubs and mindful of the general consensus that they are in fact awesome I have investigated my cable routing and have revised it AND deployed some cable noodles at the business end.

I managed to remove about 12" from each brake-line and now sponginess in the levers is all but gone and the braking seems greatly improved.

It is always embarrassing when you run into the back of a tour-mate because they can stop much quicker than you.