Breen, who is sharing a car with Dani Sordo this season, was disappointed to finish eighth at last month’s Croatia Rally after a character-building event.
The Irishman had been running as high as fifth during the Zagreb-based encounter before dropping more than 2mins when he stopped to change a wheel mid-stage.
Aside from that Saturday morning mishap, he was generally unhappy with his pace and struggled to find the optimum set-up for the tricky stages.
“It’s very clear what needs to be done, for me at least,” Breen explained. “I think we should be able to make a lot of steps before the next rally on Tarmac.
“It’s clear that the car works and obviously Thierry [Neuville] can manage it very well, but he’s been driving it for a number of years and he’s been able to fine-tune it around him. I think for someone else to jump in and try and make it work is difficult,” he added.
The 31-year-old went on to talk about how transmission tweaks could be the answer to unlocking more pace on asphalt surfaces later in the year.
“I would say it’s more on the transmission and differential side of things. This is where things are more sensitive and different driving styles are making things more complicated, so I think that’s what we need to work on,” he added.
Team-mate Sordo will jump back behind the wheel of the Hyundai for Vodafone Rally de Portugal this month (20 - 23 May) and it’s not yet known where Breen’s next WRC outing will be.
Three more Tarmac rallies feature on the calendar later in the season, including Ypres Rally Belgium, which Breen won in 2019. He is also contesting the Targa Florio - Rally Internazionale di Sicilia this week (06-08 May) in an i20 R5 car.
“Obviously, I’m sharing a car with Dani and it doesn’t take an expert to see that the next rallies are rallies that Dani does quite well in. I’ll just wait in the tall grass and see.”