Thanks SarahL and Ali for your replies. Sorry not to reply sooner. Unfortunately, I don't think we can get any more points for the 189 EOI. I've already taken PTE and got full marks and my husband's job (Mining Engineer) isn't on the same Visa list as mine, so no points there. I've got a Masters and more than 10 years' experience so no points there...and I can't get any younger!
We've now put in a Family-sponsored 489 EOI (my brother has PR in WA) with 75 points and a 190 for NSW with 70 points. The only thing with the 489 (which would at least mean we could go to WA) is that I am 41 and my husband is 40 so we wonder what are chances are for getting PR once we've done 2 years on a 489 temporary visa, especially since we will be coming up 45 by then? Assuming we might get invited for a 489 and get jobs!! This is all hypothetical, of course! Any comments or suggestions most welcome...