Point,
Don't know about your first question.
If you are on freight runs and getting $160 -180 a day and your employer is respondant to the award, and you are flying a C310/PA31, the hourly rate shoud be 1/800 of the base salary 33244 + 3847 (for IFR) plus 25%. This amounts tio 57.95 P/h.
If your duty period is more than 4 hours, you are entitled to at least 4 hours pay = $231.80
If you fly more than 4 hours, you should be paid by the hour, or part thereof.
Cheers