You're doing it right, slow additions 1 at a time. Many people kind of go crazy when they hit phase 2 and gain a little.
Also, you may already have realized this and I don't mean to offend, but when you add your phase 2 foods, don't forget to cut back a little of phase 1 foods.

(Just in case you hadn't thought of it, and if you did, just ignore this little tidbit- ok?)
The book, don't get me started! The way it's edited makes it sound like it's a low carb diet. All those quotes from people who are on the diet saying something like, "If I start to gain weight, all I have to do is cut back on the carbs and it comes right off" (paraphrasing heavily here, haven't read the book in over a year). And the recipes don't jive with what the book says...
I found another book to be much more informative:
The New Glucose Revolution by Jennie Brand-Miller
If your local library has it, it has a lot of great information.
Sarah