What is it that blowing would do exactly? Just stretch the driver diaphragm?
And I only hear crinkle when adjusting the IEM. When I'm just listening it's a nice clear sound
not stretching, per se... just flexing it a bit and hopefully set the driver in a proper position. i had an iem once that crackles everytime i move it in my ears, and that sound and feeling is a bit disconcerting. i also had experienced an iem that even with that sucking and blowing still crackles to the point that i got rid of it. funny enough, the next owner didn't complain any crackles.
so that method may and may not work everytime