But he is averaging more than 50 so far in the Sheffield Shield and Harris said the Ashes had not dented his confidence or approach to the game.
“You can get to that point where you just go above and beyond and you can spiral out of control,” he said of analysing his game.
“So I just try to stay level, as much as I can.
“I never felt like I got out of form in England, because I was not out there long enough to get out of form.
“I came back confident … I knew my game was in good stead.”
Harris has played nine Tests since last December and only scored one 50 for an average of 24.06.
“It’s been a good initiation, tough, I probably haven’t done as well as I wanted,”‘ he said.
“But in the same breath I’ve come in early against some high-class attacks, so it’s been a great learning curve.
“I feel like I’m doing everything right.
“I’ve left myself in this situation, but it’s just part of being a professional cricketer and I don’t lose any sleep over it.”
Harris said he learned a lot from the Ashes series, particularly being around Steve Smith.
While Smith has a unique batting technique, Harris took plenty from his attitude.
“He’s No.1 in the world for a reason, just the way he occupies the crease and his hunger to make runs,” Harris said.
“He never really seems satisfied, no matter how well he’s done.
“When you ask him (for) tips and he just says ‘hit the ball’, it’s not that easy.
“He’s very open and happy to help people – he’s great to lean on, Smithy.”