His racing manners were much better on Saturday at Flemington under Stephen Baster when he finished a length second to Jaameh over 2500m.
“He's young. He's very talented,” Waterhouse said.
“He couldn't explode up the straight because he'd used all his petrol in the middle stages but Stephen said he relaxed much better under the circumstances of how windy it was.”
Waterhouse, who trains in partnership with Adrian Bott, is pressing ahead with plans to pursue a start in the Melbourne Cup with Hush Writer who has 50kg.
Those plans looked to be in tatters after his Moonee Valley outing but Waterhouse left Flemington on Saturday reassured Hush Writer had the necessary staying credentials.
“The Valley was too much for him,” she said.
“In retrospect it was too claustrophobic for him. He had never been in that environment.
“He's backed up in a week. He's gone from 2000 metres to 2500 metres in a week and not many horses in Australia would have done that.”
Victory in the Bart Cummings would gain Hush Writer a start in the Melbourne Cup a month later.
“I'll be guided him,” Waterhouse said.