I think, there is quite a lot literature on this topic out there. One of the recent texts, I came across, was Ana Juncos´ "Member state-building versus peacebuilding: the contradictions of EU state-building in Bosnia and Herzegovina" (http://www.tandfonline.com/doi/abs/10.1080/13523279.2011.635650). You might want to check the reference list of this article to find out other relevant studies (e,g, Gergana Noutcheva has wrote a lot on the EU democratization policy incl. in the Balkans region).
The best documents are the annual reports of EU with regard to Stabilisation and Association Agreement(SAA) . Then I guess you have to build a jigsaw puzzle from grey literature. (NGO and independent researchers).