Hate to say it but Bandicoots and Kangaroos are the main...

Hate to say it but Bandicoots and Kangaroos are the main carriers of your tick problems.
My mother has a very large garden and is affected by the ticks both paralysis and the tiny grass ticks which you can't dig out.
Takes a Phenergan and uses a cream for the small ticks which kills them and allows you to rub them out a few hours later. She also has a freezing type spray for the paralysis ticks.
Catalyst had a program on ticks and she purchased the products recommended there.
Sensitivity seems to increase over time and they can make you very sick. They are able to kill young calves as well.