To throw in a person anecdotal experience.  My firstborn did much of what you
describe.  She clicked at every nursing, took in alot of air, and had
prodigious weight gain.  I also have a significant overactive letdown, though
may not have had it then with my first child, or I didn't recognize it. The
clicking and popping around at the breast ended at approx. 5-6 months.  I
always assumed it was because her mouth got bigger though I never brought it
up to any professional and only recognized a warning sign in retrospect.  She
nursed for a long time as well.

FWIW,

Karen Seroussi BS, LLLL, exam this summer

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