21 is a bit large for a 200. you will have to be more careful on prop choice. you can have decent holeshot, but you'll be limited on the top end. a topend prop is going to suffer out of the hole.
I run with a bunch of guys locally that have OBs, some tunnels, some pad v...
sid.castle@gmail.com
put the 200 on and have some fun. I would think you could still run in the mid 70s with a 200.
sid