na you're right mate, I probably didn't explain it too well.
By keeping your investment loans fully drawn (maximum interest which you can claim back) you can pour any extra cash into the mortgage of the home you live in, where you can't claim the interest at tax time and therefore you should focus on reducing that particular interest which is dead money.
With negative gearing you can either wait till tax time to get a refund on the interest or a reduced weekly income tax under a section 21d (ask your accountant).
IMO wait till tax time, get a lump sum back and stick into your residential mortgage, not the investment one.