Well, last start finishing pos. is not in my repertoire so, I can honestly say it never entered my mind, but there are other things that indicate this horse has some chance. I may well be very very wrong, often had been!
Incidentally my rating goes the populist way:
Marching $3.5
Kibbutz $4.5
Stockade $5.0
but Stockade shows up consistently, no matter which way I look at the field.

Try this staking plan for the quinellas & see if it makes a difference.

$7 = 1 unit.

1 1 2 2 3 3 4 4 5 5 6 6 ect

We regress back 1 stage , every time we strike a result.
e.g. 1 1 2 2 3 3 4 4w 3 3w 2 2w 1 ect.

Bank needed 420 units for a run of 40 outs

The expected run of outs at 31% is approx 18 in a row.

I would suggest one stop betting if one strikes 9 outs in a row & wait for a result to get up before recommencing.

Cheers.