Buying second property, am I forgetting anything?

First time poster, long time lurker.

HHI (Self, 285k - Partner, 220k). On a government overseas posting, so pay no rent, utilities, internet, etc. This will be the case for 2 more years.

Savings/Shares of around 500k (minus deposit, see below).

Investment property worth 1.2 million, 895k owing. 26.5 years left on mortgage. Interest of 5.19%. In ACT getting lots of tax breaks by renting through social housing (charity donation, no land tax, negative gearing, etc.).

Have just put 5% deposit down on second house, worth 1.75 million, also in ACT. This will become PPOR in 2 years, but will remain investment property in interim. Loans are all sorted for new property (5.19%), and we're settling in a month (where remaining deposit will need to be paid).

In ACT stamp duty is deductible for investment properties.

In terms of structuring, what should I be looking to chuck on the loan vs paying out of pocket? Should I use equity from investment property 1 over cash for deposit? Is there anything that I'm missing?

Welcome views, and sorry if this has come up before.

Edit: I should mention. I'm 33M and my wife is 31F. We've bought the new property to start a family - probably just one, but you never know.