"After Winton, we've come away probably a lot clearer on where we are," he added.
"There's been things that we tried that we thought would work and would've worked on my Tickford car back in the day, which were the right way [to try], but this car's just a bit different.
"You can pop up every now and then – Tassie with pole and fastest lap of the race, pretty good race pace in Perth and qualified sixth on Saturday at Winton – but it's once you understand the toolbox it goes from being here and there to regular.
"When you're up against the Penskes, those sorts of guys, they know their tools and they can get it right 99 percent of the time.
"And that's just what we're trying to find; what works, what doesn't.
"Phil's scratching his head, I'm scratching my head, it doesn't make sense to what we're used to.
"But we've got direction, that's the good part. It's when you don't have direction that you start to get nervous."