Polymetric tuplets look bad

[Wiz Aus]

<<
\new Staff { \times 4/7 { a'4 a' a' a' a' a' a' } }
\new Staff { \times 4/5 { a' a' a' a' a' } }
\new Staff { \times 4/9 { a' a' a' a' a' a' a' a' a' } }
> >

Why so much space for the first quarter note?  The 9:4 tuplets are the 
shortest duration notes, so I would expect them to drive most of the 
spacing, but they look very irregular.

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