Standard OEM rubber hoses are known for being built below par in as much as you can see the hoses expanding when pulling the brakes lever hard, I recommend you invest in some decent braided hose and you will see your breaking improve 10 folds. I assure you that is the only cure.

Go on line to HEL brakes they have made by measure lines for both front and rear hoses at the link below:

http://www.helperformance.com/hel-br...2004-2010.html

Good luck