We / I Did!
I went through every card of every 2012 round from both teams and oddly enough it worked out the the kicker bonus should be +4.
I think people have just got used to shooting a "kicker" and the improved scores reflect this. But if at the end of the season people feel the bonus is too great then bob's already stated he's open to changing it.
Oh and Paul W is a freak and should have to shoot Annie Oakley style to give the rest of us a chance.