I think as Red Ceri suggested you might benefit from the R1 linkage mod as this apparently takes some travel out of the lever and makes changes more positive. I've dug out a couple of threads regarding this for you;
http://foc-u.co.uk/index.php/topic,1052.msg7016.html
http://foc-u.co.uk/index.php/topic,2832.msg22478.html
http://foc-u.co.uk/index.php/topic,1052.msg7016.html
http://foc-u.co.uk/index.php/topic,2832.msg22478.html