The book that I would recommend is Hazel Marie Weatherman's Colored Glassware of the Depression Era 2.
It has catalog pages in it of patterns not described elsewhere. Some of the pressed glas pieces you describe as "one-off's" maybe in it. I have had my book for 7-8 years and everytime I look through it I find pieces I never noticed before. It is the book I grab first when trying to identify a piece. It is out of print, but you can find used copies on eBay on through ABE.
For EAPG I agree with Terry, Ivo, and Glen. I use Edwards, Metz, and McCain.
Unless I am reasonably certain of the motif that the piece is going to be listed under in McCain's, then I use Edward's for browsing. I find the color pictures easier for an initial identification. But as Glen mentioned E&C's books are filled with mistakes, so I always verify the information in McCain or in Early American Pressed Glass by Metz.