Do as Master Lin says and trust in the universe.
You are becoming aware of you qi.
Just to get you ready for when the feeling may go away or change. Master Lin says that as our channels open we may not experience (feel) the energy as strongly. He says this is a good time, because we have a greater capacity to hold and move qi.
At this reduced sensation time, don't be disheartened, which I will tell you is natural (or maybe I'm not natural :P). See it as a time of greater opportunity.
Getting back to your question. I often feel the puffiness. Never yet as large as you describe. There are a large number of experiences, but they are only a sign that something is happening. I haven't heard anyone saying anything like a tingle little finger on the left hand means you are loosing old grief, or that a hot foot mean you heart is healing. I say this because I thing most of us would like to have someone explain what these experiences mean. No-one has done this for me. I have even asked Master Lin. He just said is is the universal energy doing its work, I can not understand or interpret it (not exactly his words).
You are perfection,
Iam2 
