"We've done a bit of barrier work, and he seems to be breaking well enough, and he has no issues in the gates but is just a bit slow into stride.
"I'm hoping over 2800 metres at Flemington, that shouldn't be a problem and if he happens to do it again, he'll have plenty of time to make up the ground."
Cumani won the St Leger with Dunwoody in 2023 at Sandown over 3000m when the race was held back four days following the death of Dean Holland in a race fall at Donald on Anzac Day eve.
"When we won it, it was with a horse that probably had no rights to win a Stakes race, but having said that it was 3000 metres and now it's back to 2800 metres," Cumani said.
"It's a tougher race this year than when we won it."
Cumani said he would take temptation away by not entering Deal Done Fast for the Group 1 South Australian Derby (2500m) at Morphettville on Saturday week.
He said if there were thoughts of progressing to another Derby, the Queensland Derby (2400m) at Eagle Farm next month could be on the agenda.
"There is another Derby left if we want to go down that path, but I just want to see him win a race," Cumani said.
"He's been an unlucky maiden.