June, it's a great sounding piano, it's just a bit subdued, actually as a piano intended to play in concert with an orchestra needs to be.
But I've always found it necessary to brighten it up a bit, and have done that by making it the only instrument I run in "DFD" mode--direct from disc. When you select that file, you can use the Kontact player's slider to have the instrument respond more brightly to velocity. I move the slider up to 90% and that makes the piano do what I prefer to hear. So you might want to try that.