I watched an iridium flare at 7:05pm in Melb tonight on the same track. Got a good flare out of it.. Got to -4 mag.
By StarryNight, it says that ISIS 1 was in Scorpius around 8:10-8:15PM travelling in the direction you said.
The only other satellite in the area, was GPS BIIRM-6, travelling very slowly heading in a Southerly direction and slightly gaining altitude, but it was around Scorpius from 7:30PM to just after 8PM.