3rd up,

Horses often start peaking at their 3rd run in - due to fitness.

Sprinters (1000-1200m) are often best fresh = 1,2,3 runs in a campaign. But some can hold form if their runs are spaced.

Middle distance horses (1500-2000m) best runs are often 3-5 in a campaign.

Stayers best runs are often in the 4-7 range.

3rd up, Your message was hard to read. Maybe you could use a few more paragraphs and spaces next time. Just a suggestion.