I use the 4 degree offset and it works well for me.

Here is an article on arrow building that you might find useful:

Part 1: http://www.bowhunting.net/artman/publish/BalazsArrowBuilding.shtml
Part 2: http://www.bowhunting.net/artman/publish/BalazsArrowBuilding2.shtml
Part 3: http://www.bowhunting.net/artman/publish/BalazsArrowBuilding2.shtml

Here is the link to Gary's video on the Excal forum that Awshucks referred to (don't forget the oreos):

http://www.excaliburcrossbow.com/phpBB2/viewtopic.php?t=16628

Here is a link on arrow cresting that you might find interesting:

http://www.texastrackers.com/Videos/Arrows.wmv

These are my arrows:


Enjoy,

Bob