You have a fantastic idea here, I just don't think you are executing the sports side of it the right way. Why do you have two contracts for each side of the same game? You are effectively cutting the liquidity pool in half for no good reason that I can think of.
Don't worry, our system is smart enough to not cut the liquidities.
The best setup would be if they cancelled all orders when the game starts, and then left the contract open for live betting until the game ends.
Yes, we are working on options to do this.