"There are a number of different reason for the losses," Larkham said on Wednesday.
"Refereeing interpretations have been a major part of the results that we've had in the losses.
"We've been talking to the referees boss about that, and we've had a bit more focus on that this week.
"That's one of the issues. I think some individual errors on the field, some tactics, wet conditions. There's a number of different factors; it hasn't been the same reason for each loss."
Larkham conceded that while there were a few tweaks to make around how his side attacks, the bigger issue was earning what the Brumbies feel is due credit once scrum and lineout ascendancy is established.
"We build our game around quality set piece, and feel that we're not getting rewarded in that at the moment; that the referees are looking at the attacking team rather than the defending team.
"So, like I said, we've had a number of discussions this week, and hopefully we'll get a resolution out of that this weekend.
"There were a number of issues (in the loss to the Highlanders) on the weekend with interpretation that didn't allow us to scores tries from what has been a strength of our game."
Larkham insisted that switching Christian Lealiifano and Matt Toomua back into the respective inside centre and flyhalf positions they'd long occupied until this season wasn't required, though Lealiifano himself conceded that the backs must make more out of their opportunities in attack.
- AAP