http://www.marksdailyapple.com/forum/thread19263.html Also the recs of the Perfect Health Diet The Diet | Perfect Health Diet may be very helpful for you/in line w/ your needs. I believe we each have unique needs, but eating in a primal manner (focusing on real foods, avoiding gluten and sugar etc) should be helpful for most people. I think folks may get into trouble w/ primal when they consume foods that they react to/are intolerant of (for ex. eating 8 eggs a day w/ an unrecognized egg intolerance, etc) or don't eat the right macronutrient ratios for their own bodies. Some need higher carb, some need lower carb, more fat, less fat, more protein, less protein--and its really quite individual, often based on activity levels, current weight (and the need to lose/gain weight etc), age, gender and more. It's really something you need to figure out for yourself with trial and error.
What you have described (adding the rice and sweet potato) sounds perfectly primal to me, personally. Some folks seem to do much better eating a bit of starch. Also, check Mark's posts on rice and tubers/potatoes for his take on these things.
HTH! I say keep using PB as much as it works for you. Tweak it to find your own *sweet spot*!