I do agree with gonzodemon about your scale being off a few lbs.All scales are different within a lb or two.
Another thing to consider is that your string may be stretched if it has never been replaced before.This will change your brace as well.Your limbs wont have the same tension on them .
Check your A to A and brace to bowtechs specks.See if they are on.
Some bows also max higher or lower then advertised as well.
My 05 patriot is a 70# bow and maxes at 72# on my dealers shop scale.