oh yeah, one other thing.
If you haven't done this already:
take the springs off the back of the brake calipers and bend them.
you can bend them to give more spring pressure. sometimes this helps. sometimes it makes the brakes worse...trial and error.
I added spacers to my rear brake caliper on my o.c.c. which helped get it away from the chain. I also slightly bent the left side caliper up where the cable goes into it.
I'm not sure, but it seems to give the cable a slight lever effect, which seems to pull the caliper closed better.
I'm telling you, my rear brake will lock up the big fat wheel on my o.c.c.
you just have to know how to play with the entire brake set up and how tro adjust everything so it will actually work.
90% of hetting it right is trial and error tho...I can't tell you exactly how to do it because the same thing may not work on 2 different bikes.