My dear sir, please take this in the kindly spirit in which I say it:
You likely have more years behind you than ahead of you. You care deeply about your writing. You say you are working on another book. I am so pleased for you, so I hope you will use your years to focus on yourself and your future books. Look ahead, not behind. Don't worry so much about hurting those who hurt you in the past, but concentrate on what you can and will do in your future.
It's not with a book, but in one important way I am in the same situation. I have been unfairly treated at work. I am dealing with it but in doing so I am, hard as it is, choosing to look at the future rather than the pain of what has already happened and is now in the past, a time I cannot change. It's hard. It's very hard not to want to see punished those who used and abused me. But if I am going to get out of this hole I must. And I am doing that. I will be fine even though it doesn't feel like it at the moment.
I strongly recommend that you do the same. Try to gulp down your anger and let it pass. Don't worry about telling others about PA. Absolute Write has the best forums for that, and they are the best warning sign out there. For yourself, look forward. Recognize that continuing to harp on and on about PA on blogs is not effective; more importantly, it saps your attention, your energy, your time, your creative energy (even at 15 minutes a day), all assets you have that can be turned into your current and future writing. You have so much to give yourself; don't let PA take more than it has. They have that old book, but you have lots of books.
All authors have trunk novels, those that they wrote before they were published with their "first" novel. Sue Grafton once told me she had eight novels in her "trunk" before her alphabet series attracted a publisher. So maybe the one PA has is, for you, a trunk novel, a great exercise in writing but one not meant to be published.
Go forward! Drop all the blogs, hang out here and post your experiences if you want but do it to help others, not to hurt PA. Look at Merri; she has my utmost admiration for what she has accomplished, and she did that with courage and determination, not anger. She took what likely had been anger and disappointment and turned it into a plethora of books. I admire her more than I can say. And I would like some day to be able to say the same about you.
Find the way to dispel the anger you carry. People here understand that, and they understand the reasons why. But circling around and around in your ring of anger only hurts you--and you deserve better. Begin to make it better for yourself. Consider that PA book your first trunk novel. Utilize AW's writing resources to learn to make your writing publishable. It may take several novels to get there, but if you have the talent and if you are willing to put in the hard work you can get there. Do it, sir. Hand me that shovel in your hand and take AW's extended hand. Everyone here will help you move on. But you have to make the decision to stop digging first.