@mglik You correctly observe the 57s are missing some punch on gutsy material. This has always been the case and there is nothing to be done. Peter Walker conceived them for operation with quieter music such as chamber groups and voices not backed with a big orchestra. They excel on that.
But on rock and large orchestras on powerful pieces 57s won't satisfy many people. This kind of issue is why many of us have more than one system. Horses for courses and you just have to choose which way to go. It's always a compromise.