Here's "the system" for this year. Looks like it'll be especially unhelpful though: two thirds of the field are on the top two rungs! No horse gets a perfect score (unless there are some substantial odds changes for some of the runners).

Total	Name	Less than 8yo	Wgt < 57kg	Not a mare	<= $21 SP	< $16 in last	Wgtd < than in last	FS in last >= 10	Won Black Type	<=3L in last	<6 victories
9	ABSURDE	1	1	1	1	1	1	1	0	1	1
9	CLEVELAND	1	1	1	0	1	1	1	1	1	1
9	FUTURE HISTORY	1	1	1	1	1	1	1	1	1	0
9	GOLD TRIP	1	0	1	1	1	1	1	1	1	1
9	INTERPRETATION	1	1	1	0	1	1	1	1	1	1
9	MORE FELONS	1	1	1	0	1	1	1	1	1	1
9	SERPENTINE	1	1	1	0	1	1	1	1	1	1
8	ASHRUN	0	1	1	0	1	1	1	1	1	1
8	BREAKUP	1	1	1	1	1	0	1	1	0	1
8	KALAPOUR	1	1	1	0	1	1	0	1	1	1
8	LASTOTCHKA	1	1	0	1	1	1	0	1	1	1
8	SHERAZ	1	1	1	0	0	1	1	1	1	1
8	SOULCOMBE	1	1	1	1	1	0	1	1	0	1
8	VAUBAN	1	1	1	1	1	1	0	1	1	0
8	VOW AND DECLARE	0	1	1	0	1	1	1	1	1	1
8	WITHOUT A FIGHT	1	1	1	1	1	0	1	1	1	0
7	ALENQUER	1	1	1	0	0	1	1	1	0	1
7	DAQIANSWEET JUNIOR	1	1	1	0	1	1	0	1	1	0
7	MAGICAL LAGOON	1	1	0	0	0	1	1	1	1	1
7	MILITARY MISSION	1	1	1	0	1	1	0	1	1	0
7	VIRTUOUS CIRCLE	1	1	1	0	1	1	1	0	0	1
5	OKITA SOUSHI	1	1	1	0	0	0	1	0	0	1
5	RIGHT YOU ARE	1	1	1	0	0	0	1	1	0	0
4	TRUE MARVEL	0	1	1	0	0	1	1	0	0	0

You might have more luck with biorhythms! Breakup, Military Mission and Vauban will all be at their top physical rating on the day, according to that silliness

I've spent very little time looking at the race but Vauban, Gold Trip, Future History, and Breakup can be my guess at the first four.