Setting Coda symbol in it's proper place

[chip]

I am struggling with the location of the Coda symbol. I am using this code -

\property Voice.TextScript \override #'extra-offset = #'(0.0 . 5.0) 
\mark \markup { \musicglyph #"scripts-coda" }

No matter what numbers I plug into the parenthesis the symbol always 
stays in the same place - directly over the barline (which is fine) and 
too close to the beam of the last 8th note in the measure. I have tried 
numbers as high as 20 to move it up, but it will not budge. I do have 
chord names above the bars, if that matters. I have text "To Coda" 
previous to the Coda symbol, and I can move it anywhere with no problem. 
Just the Coda symbol is being stubborn. Any suggestions?
Thanks
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Chip