this is starting to head in the right direction although I'm not crazy about the color scheme - I was opposed to "arrows" because it isn't as creative - so maybe work with it a little bit but of everything I've seen this is closer to the right track
I really want something more clean lined, bold, strong - not very detailed and definitely not solid gray - I don't like the gradually getting larger idea... my favorite that you've done so far is #33 but I know there are other concepts that would work with a little more time/thought