Test with out support 25° and more is OK
With White ABS
Nice, got a link to the test object you could share please?
here it is : http://www.thingiverse.com/thing:419860
enjoy 
Thanks!
This got me thinking. Rather than overhang supports that come up from the print bead why not have supports that extend from the print itself? A bit like the way skyscrapers build the central lift core first and have the scaffolding inch it’s way up supported on the levels below.