Staff.instrument collides with choir staff

[TS Sunhede Fulk]

Hey everyone,

I'm trying to setup a template for my renaissance choir. I want to  
include the name of voices, so I used /set Staff.instrument #"Cantus  
" etc.

However, Cantus and Bassus are colliding with the choir staff  
bracket. I tried adding spaces to the end of voice name, but it  
didn't do anything. I also tried to google for the information, but  
could find any tips.

I'm using 2.5.29, Mac OS X binary.

Sincerely,
Ted S. Sunhede Fulk
Örebro, Sweden