There are a few ways i think you need to improve the rating:
1)Shouldnt be able to vote for yourself.
2)Take off the 10 spread it around rule, it really isnt fair. Say i had two big questions, in two different topics. And the same person answered both..It really isnt fair to not give them points for the hard work...So maybe put it at 5 or something?

thats about all i can think, but itd be 100x better