tweaking ending brackets and chord name heights

[bernie arai]

i'm writing a lead sheet (single staff melody with chord symbols
above) mostly with success so far.  however, i've noticed that when
using alternate-ending repeats, lilypond puts the chord symbols above
the repeat ending brackets, making the chords unappealingly high for
that entire line.  could someone point me in the right direction to
figure out how to adjust the relative heights of the brackets and
chord names?  i have a feeling it'll be more involved than i will
immediately understand...

thanks in advance,

bernie