I have Kool Stop greys on my 74 Super Sport, and as heavy as the bike (and rider) combo is, it stops better and smoother than nearly any bike I have. In my experience if you want violent stop NOW performance on steel rims use black rubber, like Jagwire blocks. Of course they may need replacing fairly often. The evidence of this will be a lot of black dust on the forks and seat stays. In wet weather almost nothing will make a steel rim bike stop well. I prefer good modulation and good stopping power over stopping fast with no control. You don't need to slam the brakes every single time you need them. Necessary sometimes yeah, but not always.,,,,BD