AFAIK, the Fin used the plinth on which the block rests for your feet, and some holds snapped. Quine doesn't, and uses what's left. As for the grade, most people (cheat) dyno through what is otherwise a nice powerful undercut problem, which is a bit easier apparrantly. I gave it V10 when it was first done, but only becuase I was told it was. God knows what grade it is, 7c was the consensus when I was writing the guide, it may be thought of as easier than that now.