All OS brakes are pretty poor mate, as you've mentioned, none of us are what we weighed aged 13 anymore.
Tuffs are worse than alloys, better if you add new school type pads, such as Xposure, but these squeal like a pig.
I always put a single brake (rear) with my alloys, and use tan DC blocks, they seem to be ok for me, and I'm nudging 15 stone.