Nice to see another Aussie on DV!

I was having trouble with my dream stability recently, too. The technique described by AnotherDreamer has been working wonders for my dreams over the last month or so.
I've gone into a bit more detail in the intro of my dream journal here, if you're interested.
It seems that the less I worry about instability, the less it's an issue for me.

You'll probably come across other stabilisation techniques around the forum too, like spinning, engaging your senses (eg. rubbing your hands or biting something), or verbal commands. Different methods work for different people - it might be worth giving some of those a try.
I've also seen some cool ideas for getting your eyes working, like taking off imaginary glasses/lenses, or simply realising that you're not restricted by eyelids in dreams because you don't have eyes! (I believe those ideas came from Sensei and Sageous, respectively.)

Good luck, I hope you find something that works for you!