The gelding won the Grafton Cup Prelude last year before finishing ninth behind Supply and Demand in the Grafton Cup.
Munce said he had learned a lesson from last year's defeat in the Grafton Cup.
“He did get a little bit of a bump last year but really I don't think he handled backing up in a week from the Prelude,” Munce said.
“First Crush has had a fortnight to get over his run in the Caloundra Cup and he deserves to win one of these staying races this winter.”
Munce has been aiming First Crush at the Grafton Cup (2350m) but admits he was tempted to head to the Queen's Cup (3200m).
“In the end he has only 54.5 kg in the Grafton Cup and I know he can handle the track. He races like he wants 3200 metres but in the end I think there are more pluses for Grafton,” he said.
First Crush is proving a great money spinner for his syndicate of owner which is headed by Munce's long time friend Max Whitby.
“Max and I go back a long way to when I won big races for him as a jockey and I would love to win a big race for him as trainer,” he said.
Munce won the Grafton Cup twice as a jockey on Count Scenario (1999) and Storm Hill (2005).
Mark Du Plessis, who rode First Crush in the Caloundra Cup, will retain the ride.