if you nipples have become puffy while using AIFM (or any aromatase inhibitor) the most likely cause is prolactin (since you are not using an progestins).
However you can try using a small amount of AIFM directly on the site (be sure to exfoliate really good as that skin is somewhat thick). This seems to work, though why exactly is not clear.
there are a lot of dopaminergics- selegiline, bromocriptine, l-dopa, cabergoline, tyramine- that you can use as well.
4 pumps is generally more than enough for the dosages you are using.