Yep that's what I was using.

The spreads for 2 seasons should be enough to test the system, and I have decades worth of other stats.

I will be looking at crowd size to see how much of an influence it can be in a game.

How much difference is there in how refs rule the game (you know how the refs style can be a large influence in rugby union). If there is you might find advantages to exploit props.

I might even look at weather. If the weather girl says there's an 80% chance of raining, then you'd think best bet is to judge to game as if it was going to be wet. Totals would go lower and margins should be smaller. I doubt the TAB goes that far (analysing how weather affects the game).