How can I position the labels for my pie chart appropriately? - javascript

So I'm making a pie chart, and I am attempting to recreate this
However, I can barely position my text labels to not get obscured by the pie slices. Here is my jsFiddle
Setting the z-index for the text attribute in the above fiddle doesn't inhibit it from being obscured.
In addition, how can I assure that the labels are outside the pie chart? I tried setting an offset from the center on the labels, but then they are obscured by the edges of the svg.
Any input would be awesome.

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I have setup a JS Bin example showing the issue:
http://jsbin.com/fejeyi/5/
The first two charts are using position bottom and you can see the pie's are different sizes, but the legend displays correctly.
The second two charts are using position custom and you can see the pies are the same size, but the legend is left aligned.
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Here's the source of the JS Bin:
http://jsbin.com/fejeyi/5/watch?html,js,output
Cheers!

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