Bipolar ex wife has mentally ill public drug users around my son. Can I prove her unfit?

To give you the background...my ex wife is bipolar, diagnosed since '94, I am too since '07. We recently (reluctantly on my part) agreed for me to get my son the first and third weekends of the month. She crippled me in court getting a protective order. (3rd in two years. First time I caught her trying to have a with my son locked in his room after we had been separated a week. She filed a PO and dropped it 6 days later. The second time, I had tried to move on with a woman who had it more together (wife would not work, kept racking up CC bills). She cited my own bipolar, denied hers. I now have doentation of hers and she finally admits it in court. I didnt have proof at the time. Once she found out I dumped the gfriend, she dropped it citing "he has never hit me, cursed me, or harmed me physically, and I know he would not" on a dismissal form. The third time, I informed her I would take our son with me if we split, she had me removed). I fought for 8 months to see him two days a month, then in December got the first and third weekends of the month supervised. I found out recently her best friend who I found baby sits my son on occion and stays overnight has posted a pic of herself on facebook smoking pot along with various references to drugs suck as "Heavy narcotics" and ual exchanges with my wife (they are both bi and had a previous relationship). She is also bipolar, has stolen pills from my ex in the past, and has been found almost dead in a bathtub before with her wrist slit. I had run her off while were together but she is back in the picture in my absence. My son informed me his Mom has a new friend staying with them so I sent a family member who videotaped his truck in her driveway throughout the night after my son was returned. I know the guy through a mutual friend as being a paranoid schizophrenic on disability. My son has also told me of another friend who comes over (with a criminal record in the past 5 years for Eluding Police and Leaving the Scene of an Accident. I know the guy as an alcoholic. In court, they dont want to hear the old issues though I hope with a new hearing my ex will bring up the bogus protective orders grasping at straws allowing me to defend them with my doentation which shows a conflicting pattern. If my bipolar ex has had the gall to use my own bipolar as a reason to keep me away in the past, what business does she have with those degenerates. My condition is stable (Only aggravated when my son was removed from my life unjustly) and I have found a good woman who knows the past allegations are completely false (she has known me ten years) We are planning to get a house with a bedroom for my 6 year old son and I have told her we would probably have to get married. She supports my decision to pursue full custody, has met my son, he asks to see her/go over her house. She has been a witness to many of his statements including his "hating to go home" My ex is also in contempt of a provision SHE asked for, no corporal punishment. My son tells me his Mom and another one of her friends has ed him recently. There is also a Property Settlement Agreement she is trying to nullify at our final divorce proceeding that states neither party shall have unrelated members of the opposite around him after nine. I have a competent attorney on my case, but thanks to the enormous complexity of information I am confronted with it takes about a hundred dollars everytime I give him a written summary of her stupidity to review. The order drops in November of this year as I have abided by it to the letter. What are my odds of getting custody from her with the PO in place, what are the odds after it is over, and at the very least, can I have these shady individuals ordered to stay away from him? This new woman in my life is gainfully employed at the same company for 7 years, makes more than my ex did when she did work, has no criminal record (neither do I) and has no mental illness. I would appreciate any advice on the matter