Guys, its not wise to mess with expensive changes in cylinder sizes from just pedal 'feel' alone without running the pads in on the fly for a good bit, it can make a huge improvement to the pedal height and save you chasing your tail, frame type sliding calipers need a lot of running in, personally, a mechanical balance bar is far preferable to hydro valves which also affect pedal feel, i don't like these and avoid them like the plaque, as Clive says, you shouldn't need both.