Blowing on the capsule does not do anything. You need to perform a humidity test. The way you do this is the same way you would put moisture on your glasses to clean them, or the same way you fog up a window. Its not blowing, its like a "hoahhh". The moisture from your throat will come out. Immediately after you do so you will either notice- A. there is significantly less volume, B. it makes a sputter noise and cuts out, C. both.
Either A, B, or C, you are due for a reskin.
However, it does not sound too much like a capsule issue to me anyways, but its worth a shot.