OK, I think I can offer something here.
First of all, the bias is something that you'll see in most cases. Unfortunately for you, you have male genitals and you don't have a video tape of your ex beating children and puppies. If you and the ex are both fair to midland parents, this report does not surprise me in the least. GALs are the source of mommy bias at least as much as the courts if not more.
Second, I understood after my game had played out that a judge will not grant joint custody if the parents are bringing the full custody battle to him for his decision. It will go sole one way or the other. You can agree on joint without a trial but don't expect joint if it goes to trial.
Third, there is a clear misunderstadning on what you can and can't see as far as reports. I had two GAL's and saw both full reports. However, there was psych testing performed during the evals and this test result was something only the GALs were granted permision to see. The reason is that only the psychaitrists are trained to interpret the results and they don't want untrained people thinking they know better how to interpret. So in your case, do not expect to see test results. However, certainly the GAL's report is not only something you and your lawyer can view but something you must be able to view for any trial preparation. If your lawyer does not know this difference, fire their arss immediately.
"I get knocked down, But I get up again,
You're never going to keep me down" - Chumbawamba