Don't close your account! You might get a measly $500 credit limit.
I think you're likely to be overextended due to the fact that your total credit limits exceed your income. I would close the two AU accounts and then ask for a credit limit increase on the freedom card.
Wait for others to chime in before taking my course of action.
Why dont you open a chase Freedom mastercard and then if you get the high limit move it over to the visa later
Your current level of income doesn't warrant a significant CLI IMO. Between the two cards you already have 10k in credit limit with Chase. You may want to save the HP for something else.