tremolo placement in crimped staves

[Mike Solomon]

Hey all,

I’m working on a piece where staff space is used to indicate intervals.

In a staff where the distance between lines is halved, I need to double stem 
lengths (which are calculated in staff spaces) so that stems are comfortably 
readable.

However, tremolos are shifted up on these stems compared to their usual 
placement.  Is there any not-too-hackish way to bump the tremolo down to an 
aesthetically nicer place?

\version "2.19.0"

{
\override Staff.StaffSymbol.staff-space = #0.5
\override Stem.details.lengths = #'(7.0 7.0 7.0 8.5 10.0 12.0)
g'4:32
}

Cheers,
MS