@LSM: interesting, there seems to be a difference in our respective documentation then. In ours it says that RTO uses maximum available brake pressure whereas the landing settings are modulated up to a maxmum of 3000 PSI in case of MAX.
However i am the first to admit that our documentation is woefully bad and that could just be a transcription error and not the real technical explanation. Sadly we as pilots do not get access to the AMM.