GrandStaff vertical distance

[foxfanfare]

Hi all,

I'm trying to configure a template for my orchestral works but I have a
problem with the GrandStaff vertical distance. You can take the template
proposed in the manual to see the problem:
http://lilypond.org/doc/v2.19/Documentation/learning/orchestra-choir-and-piano

You can see in the string section, between Violin II and Viola, an extra
space is added due to the use of the brace of the GrandStaff. (Same problem
with the Alti group in the choir).

I have made some ressearch in scores and also in Gould's book, this is verry
unconventional. A space is added between the StaffGroups, but should not
appear within the same family.

How could you properly change that? I tried with:
\override GrandStaff.StaffGrouper.staffgroup-staff-spacing = #'(
        (basic-distance . 9)
        (minimum-distance . 7)
        (padding . 1)
        (stretchability . 5))

But this will move above AND bellow the GrandStaff. Here is in my score the
illustration of the problem:
distance.png <http://lilypond.1069038.n5.nabble.com/file/t5604/distance.png>  



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