I am also running the 13/50 setup on my EC300 and find it perfect for the woods.  Run a lot of 2nd and 3rd gear, as well as some 4th - only use 1st in the tightest situations, but it comes in handy when needed.  Often start in 2nd.  Agree with the previous post re the bike becoming a wheelie machine... have to keep your weight forward.  Would recommend 13/50 unless you do a lot of open area or road riding.