What I mean is when playing a chord, on any instrument lets stay in your track at Bar 10 you are playing a C major chord on the strings and piano. Piano can play the regular triad C-E-G , but changing voicing for example to C - G - E (the E an octave higher) which is an open voicing and lets say the strings will play C - C - E - G (E and G an octave higher) to open up the voicing and give some air to the chords, it won't clash anymore in the same register. This is just a simple example to apply. You can use stacked chords but be careful and it depends what you want to achieve in terms of sound range and the relation between your other instruments.