I think the issue with the old Canberra circuit was that a number of points were made effectively narrow. That is, you have corners and bends packed together in sections such that the effective width of practical racing surface/line was narrowed down.
Three spots stick out to me as places where changes would have helped the racing quite noticeably. At Turn 1, it should have just been a straight-in run. That extra bend to the left makes it easy to make it a one-line-in corner, and thus eliminate overtaking possibilities. Bypassing the complex at Queen Victoria Terrace would add another respectable "straight" to the lap. Finally, removing the chicane at Flynn Drive would give a nice, long run into the final chicane, along a stretch where you have three full lanes to work with no less.
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