There are previous posts about the brakes.
I think the problem is more to do with the amount of dive in the forks that give the impression of poor brakes.
Without doubt, fit stainless brake lines. You can upgrade your discs and pads also but try putting 8-10 psi in your forks with a bicycle pump. This will make the world of difference.
The combination of all the above works for me. Some have fitted progressive fork springs that offer massive improvment.
Like I said, Check the earlier threds and you will find links and part Numbers etc...
Hope this helps
"Whats in that thing??", An R1 owner said.