Try this

.Target the top 5 in Pre-post

.Compare their Pre-post price to Betchoices opening price (far LHS)

.Bet all of those 5 that have a shorter price on Betchoice when compared to Pre-post price.

.Bet these at 1.3 units

.The remainders of the 5 are bet at 1.0 unit.

.Don't touch races with odds-on Favs.

What you will find is the very high number of success from those that have the 1.3 units on them.

Your run of outs will be minimal.

Try & bet with Betfair for the stronger value.

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Cheers.