hi radozgo,
Not in law but I would suggest looking at your literature review. It may be that your questions are to big without any detail. My research proposal was noted as "huge" but I had a list of several smaller research questions inside it that could mostly be answered independently .
So I would recommend you to ask what do I need to know/answer? Are there any problems or difficulties you foresee in your research plan, if so explore them. Work out a methodology to answer the problems and voila, you have a more focused research proposal. Again I am engineer, so this might not be applicable.