ORIGINAL: KodiakArcher
Yep, I think TFOX is on to it. Reset your center shot. Then go to one of the many tuning methods (paper - a good starting point, walk back - probably best for your application, broadhead - my personal favorite...)
My link addresses bare shaft,paper,walk back,broadhead and group tuning.
No long explanations for each so if you need more detailed instructions just ask,there are MANY that are willing to help.
The easton tuning guide is a must read for someone starting out.It is filled with knowledge.Some of it more usefull than other.
www.eastonarchery.com
http://www.eastonarchery.com/downloads.asp