It's impossible to read the settings in the image you attached, it's way too small.

Regarding your problem, I think you could print that part without using supports at all but if you must I think newer versions of Slic3r (1.0.0 and up) handle them better, also there's a new option for pillar type supports that use much less material. I haven't tested any of that yet, but you may want to take a look.