Current leading Melbourne rider Blake Shinn was instrumental in helping Corstens with those plans after partnering Bittercreek in three starts in Queensland, including when second to Broadsiding in the Group 1 J J Atkins (1600m) at Eagle Farm in June.
"I had a good conversation with Blake Shinn who was riding Bittercreek at the time after we ran in the J J Atkins and ran second," Corstens said.
"Blake suggested that Bittercreek didn't get the mile, so that really set the tone where we wanted to go in the spring.
"I changed my mind and thought that we would concentrate on the Coolmore instead of the Guineas and hopefully I've done the right thing."
The decision to aim for the Coolmore allowed Bittercreek more time in the paddock in the Queensland warmth before preparing for his return in the Group 2 Danehill Stakes (1100m) at Flemington on October 5.
Corstens was planning on having just that run as a lead-up to the Coolmore, but Bittercreek performed below par that day on a track softened by rain.
"In hindsight I'm glad he had the run in the Red Anchor as well," Corstens said.
"He carried more weight than the others and he really attack the line which I thought was terrific.
"Back on top of the ground was the key and I think he's ready to go in the Coolmore."
