Sorry to necro, but I'm relatively new to this game, and this was the first thread that came up on the search... (I didn't know what "normalized" meant either)
But to ease kevkev60614's reply (ty, btw, for replying) you add the win% against each FG (in fraction or decimal form), and then divide by the number of FGs involved in the calculation(29 right now, right?) Basically just restating for the math disinclined, like myself:
(0/9 + 6/7 + 8/14)/3 to use the example above, with only 3 FGs involved. (or more directly: (0/9 + 6/7 + 8/14)*1/3)
(yes, I know that is a basic distribution law, but it has been so long it hit me like an epiphany, so I wanted to share for those too eager to take the time to let it sink in -it simplifies the calculation greatly)