I don't do anything special either with the exception of a greek yogurt everyday like you do. I don't even drink that much and I have no issues with dehydration. I know you mentioned you put on some weight so maybe just try and cut your sugar intake and carb intake and I bet you will lose. Along with some exercise of course. I gained an extra 15 pounds back after my takedown and last summer I cut out all sugar (that's my weakness) and hit the treadmill and the 15 pounds came right off. I have been able to maintain it too and still have a treat for myself each day now.
There are definitely things that I'm not absorbing and iron is the main one for me. I am still anemic after all this time and the only thing that helps me are iron infusions. Oral iron hasn't helped. No dr. has been able to tell me why because they say all the nutrients are absorbed thru the small intestine which I know is true but I have no explanation to my iron issues.