The piano sounds like it's being played a maximum velocity on every note of every beat, which will sound overly harsh/bright with any sample library - or, indeed, a real piano. So, the absolute most natural way to help reduce this is: lower the MIDI velocity to, say, 90-100. You could also experiment with reducing the velocity of the top note of each chord to be, say, 10 lower than the note below. This, also, is a more natural way of gently reducing the brightness of the piano, without just reaching for an EQ. Finally, the chord voicing itself may be a little thin. Try dragging the top note of each chord down one octave. What does that sound like? (Obviously: sort out the voicing before adjusting the velocity of the top note!)
The hat, when it came in, was super loud. Yank the fader down 6dB. You might, then, wind up nudging it back up by 1, maybe. But it is way too loud, IMHO.