How to have an awesome show tourney:
1) Open, B division, and Classics. These are the only divisions you should have.
2) Use Karl DeAngelo's Never Drains Tourney Manager; it's the only software you should consider.
3) Take the tournament format from NW Pinball Champs or California Extreme or INDISC. They're the only formats you should consider.
4) Marvel at how your tournament runs smoothly with minimal effort compared to a crazy homebrew operation.