G'Day Mark, any particular Pre-post there?

I ask because I find great differences both with opening prices and Pre-post prices, eg.

MR1-1 Betchoice op.= 7 1st fluc =6 IAS Op 5.5 1st Fluc = 6.5 (the only firmer and the winner if you used Betchoice)

MR1-8 Betchoice op 3.8 1st Fluc =4 (no bet if you used Betchoice ) BUT

IAS op 4.8 1st Fluc = 3.8, so a firmer (the opposite) if you used IAS