3D Titles Don't Render Correctly at Best Quality

I just began playing around with the new 3D titles in FCP X/Motion. I am doing a virtual camera dolly in on the text with a depth of field effect to match a slow real world push in. The text looks fine initially, but gets all blurry and pixelated once I render, either in Motion or by publishing the title to FCP X and rendering it there.

For now, the workaround is to render in Motion at Normal quality and bake the effect into the video, which works fine for this particular project, but obviously it would be nice to be able to publish 3D text to FCP X and have it render correctly. Has anyone else had this issue and know of a fix?

Here are a couple screenshots showing the title before and after render. The artifacts introduced in rendering are even more pronounced when it's not just a still frame.

Computer specs: iMac 27in (Mid 2011) 3.4GHZ i7, 16GB, AMD Radeon HD 6970 w/ 2GB, OS X 10.10.3.