Through an incomplete process of elimination I suspect that if you haven't heard anything yet, then it has nothing to do with your experience, date of application or notice - your application was simply less desirable than the guys who have been called ahead of you. As previously mentioned, they probably sort the initial batch on those branching questions and use further processes thereafter to refine as required.
Have some hope that once a tranche of two have been interviewed with some rejections they'll work through the rest in due course.