I don't have any experience with Avandia, however, I am on Actos (along with Gluc.) I did a quick search on Avandia and it looks like it's similar to Actos.
Here's the link.
Actos and Avandia
It looks like 8mg is the highest amount one is given. I'm on 30mg of Actos and my Endo. said there's no advantage for me to go with 45mg since 30 seemed to work. I'd probably start with the lower dose and move up if needed.
As far as gluc. did you try the extended release? I've taken gluc. 2 different time periods. The first time it was 1000-1500 mg and I didn't ovulate. The second time I did 2000 and still didn't ovulate. About 4 months later we added Actos and about 2-3 months after that I started having cycles for the first time in my life.
Good luck and I hope Avandia is just what you need!!