I find the discrepancy between the hourly rate that some of you quote and the dual-solo price difference quite significant actually.
1/. Under the award, you are not entitled to claim pay for hours you have not flown. You weren't on board your student's aircraft when they did their solo (I hope).
2/. If a casual instructor is paid something for their student's solo flight time, that's a deal with their employer.
3/. To get an hourly award rate, divide the rates quoted above by Tulsami by 800 and multiply by 1.25