Not sure if any of this has been posted, but I have some tea on the album tracks / possible outtakes.
Always
Composers: Carmen Reece, Samantha Jade, Jon Levine
Note: Same team who wrote Armour, Carmen has written songs for Ariana Grande, Jon for Rachel Platten. Written after Armour (likely in the same sessions).
Naked
Composers: DNA Songs, Samantha Jade
Note: Same team who wrote "Firestarter" and "Soldier", written after both of these songs, likely some time in late 2014/early 2015.
Wait For It
Composers:
Tiffany Fred, TBA
Only Just Begun
Composers: DNA Songs, Samantha Jade
Note: Likely written in the same sessions as Naked.
Show Me Love
Composers: Hayley Aitken, Carlos Battey, Steven Battey, Johan Gustafsson, Frederik Haggstam & Sebastian Lundberg
Note: Hayley has written songs for Ricki-Lee and was in the group Scarlett Belle with Reigan Derry (X Factor 2014) before they disbanded. Written just before Naked/Only Just Begun, so 2014/2015.
Let The Good Times Roll
Composers: Zac Poor, Jackson, Kasirye, Russell & Barry
Note: Looks like this was written around the same time as "Firestarter".
Castle
Composers: Hayley Warner, Zac Poor, Khaled Abdulwahab, Samantha Jade
Note: Written around the same time as "Sweet Talk", Hayley Warner was the runner-up of the last season of Australian Idol in 2009 and has since written songs for many Australian talent show artists.
I also found info on a few songs that were probably early outtakes / planned to be on the original album with "Firestarter" and "Soldier".
Don't Give Up On Tonight
Composers: DNA Songs, Samantha Jade
Note: This looks like it was written before "What You've Done To Me"... which doesn't really make sense.
Good Thing
Composers: Samantha Jade, Jaden Michaels, Britten Newbill, Mighty Mike
Note: It looks like it was written very recently, even after Shake That and Armour.
Just Wanna Dance
Composers: DNA Songs, Samantha Jade
Note: Written sometime between DGUOT and Firestarter.
You Make Me Feel
Composers: DNA Songs, Samantha Jade
Note: Written around the same time as Firestarter.
There also appears to be a solo version of Shake That registered.