Just caught this. I don't know how much this will change things for you, but at least I can identify part of the problem. You did poor math when you looked up the 2008 NBA Finals stats.
Actually helps Kobe in a couple areas but significantly changes the shooting percentages in favor of Pierce.
You really should double check your work if you're doing the math yourself. I thought you just went to nba.com, which would have been significantly easier:
http://www.nba.com/celtics/stats/200...als_stats.html
http://www.nba.com/lakers/stats/2007...als_stats.html