RE: Do you line them up?
I don't line up my fletch with my broadhead blades. I've never found it necessary.
B-rice, above was mentioned that it's more important that the broadhead and arrow are in the same plane/alignment here is crucial. If you must align your heads it will depend on your inserts and glue used. If you have aluminum inserts and hot glue, you can install a field tip partially screwed in and heat the end of the tip, it should heat the glue before the carbon arrow and allow you to spin your insert. Be careful not to apply heat directly to the carbon arrow or you might damage it.
If you have epoxy'd aluminum inserts, again, with close scrutiny, you should be able to heat the field tip, again, be careful...with carbon inserts, in carbon arrows, you should spin test them when installed, it becomes difficult to realign these once set....
<font color=blue>Good Luck and Good Shooting</font id=blue>
<font color=red>Rob</font id=red>