In that case I think it is just your mind playing tricks on you. It can be difficult in the beginning to sense what "full" is, because you are 1. still getting used to the pouch and 2. things are still very swollen at 2 months out. In my case as well, years of overeating had almost worn out my sense of satiety.
Trust me - with a 30cc pouch, if you DID eat too much, you would feel it. You just haven't felt that yet because you have been doing exactly what you are supposed to be doing and sticking to the correct sized meals. So well done.
In terms of dumping, be aware that not all bypass patients dump (I don't, for example).
Since all hospitals are different with their post-op diet guidelines I'm not sure what stage you are at, but if it is similar to mine you should just about have started moving onto solids by now. That will also make a difference to the fullness feeling. Dense proteins like egg fill me up pretty quickly, while I can eat quite a lot of salad and soup for example.
Try not to worry and just keep doing what you are doing!