I think we had this discussion before....I still don't understand why your mini Vees are weak....I find them better than the best cantis....I certainly don't understand how you get poor performance and rapid pad wear, the two seem opposites?
Anyway, back to the cantis.
this is a mid-profile......cable anchor just above the pad...
Mid profile would always be my choice of canti with drop bar levers. Set up carefully, they are reasonably powerful, and the power doesn't fall off too much as pads wear and the straddle bridge goes up.
Low profile cantis (stick up in the air almost like Vee brakes.....cable attachment well above the pads) are more powerful initally, but the power quickly falls off as the straddle bridge goes up with pad wear, and they need re-adjustment more often.http://forum.ctc.org.uk/viewtopic.php?f=5&t=57410