With Lowndes now retired and Triple Eight's third entry parked, Dutton says refinement is the key.
"It's a massive year for us, going back to two cars means we can be really focused on that," Dutton said. "That's really exciting.
"Bathurst is obviously one of the major prizes. It's always a toss-up which one you'd prefer but we didn't get the second-biggest, which is the drivers' championship.
"To do that, it is about the consistency. [Having] more people in roles they know, less fresh faces because everyone's been there, everyone's blooded now, refinement, our pitstops – our time in pitlane cost us during the year – so we can refine all of that.
"We worked pretty hard, everyone's really motivated, throughout the whole team, to fix all those little errors.
"That's really what cost us in 2018, we didn't do the best job we could've."
While Lowndes has stepped back to co-driving duties with Whincup, Triple Eight will run four Commodores in total in 2019, returning to the Dunlop Super2 Series with youngsters Kurt Kostecki and Brenton Grove.
That accompanies other racing including its Mercedes attack on next week's Liqui-Moly Bathurst 12 Hour with van Gisbergen, Whincup and Lowndes.
The team's broader workload has been significant in recent years with the development of the ZB and Holden's now-parked V6 turbo engine project.
This time last summer, it was thoroughly occupied building new Commodore chassis – three for itself and one for customer Tekno – and parts for other Holden teams under its arrangement with the manufacturer.
"This has been a good break," Dutton added. "It's been a pretty chilled one for us.
"[There's] a lot of work to do, a lot of refinement, having more cars running in the Development Series and other categories this year, that'll keep us busy.
"The off-season has been fantastic, actually feeling refreshed for the first time in three years, so I'm pretty pumped to go."