I don't know if this is the "optimal" technique, but in each .ly file, I have a "layout" block the sole purpose of which is to dictate line breaks:
layout = \notes { s4*4*5 \break s4*4*3 \break % etc. }
Then I just roll it into the \score block:
\score { { \context Staff = violin { << \layout \violinNotes % etc.
Since each .ly file has its own layout block, you can line-break each part or score separately.
I hope this helps!
Best regards, Kieren.
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