The Giants managed 39 clearances to the Power's 24, and the rookie coach was frank in his assessment of the discrepancy.
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"I thought our clearances overall were a bit awful," Hinkley said.
"The numbers will say that, and we've got some work to do in that area.
"This was a young team, but the same young team that we played against got hold of Sydney in the clearances last week too.
"They're doing some really good work."
Superior fitness was a major difference between the two sides, with the Power able to pile on 11 second-half goals from 22 scoring shots to the Giants' five from 12.
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Hinkley said forward Jay Schulz would be monitored over the weekend after he was subbed out of Saturday night's match at three-quarter time with an ankle injury.
The coach was confident both Schulz and Hamish Hartlett, who had a bruised back, would be fit to play in next weekend's Showdown against Adelaide.
