A long time ago, I would think that the prefixes were important too and that I could somehow use them in my code.  But eventually I just realized they dont help very much.  Its still all just a random search space and the solution could still be anywhere.  My code though is also terrible and can only find 1BY8G prefixes most days.  So you guys are far ahead of me in your progress if you believe that the longer prefixes are important.   I just am trying to say that I dont believe they are as important anymore.  I am more in agreement with the skeptics that post here recently about the prefixes instead.