UT - Congratulations of being a rare and dying breed, that is, investing for income not capital gains.
You say you used fixed loans, somewhere around the 15 year mark. I believe Commonwealth Bank is the only one who offer such long term periods. When I checked at the bottom of the rate cycle they were offering 15 years for around 6.99%. I haven't seen property offering this sort of yield in years and currently it's generally around 4-4.5%. So I am correct to assume you have sizeable deposit such that your rental income covers the mortgage rate?
Please correct me if my figures or assumptions are incorrect.