If 300mg a week of primo is all that your using save your anti aromatases for when you need them. You may not even need clomid post cycle, I know that I wouldn't.
I could be wrong here, but Primo is not supposed to convert to Estrogen. So if your nips are hurting I bet you get Fake Primo and it is Test. POst cycle if it is truely Primo your taking Clomid should be fine.
your right bro. primo structure is made so that chemically it cannot be converted into estrogen. i think he may have a naturally higher level of estrogen to begin with, and is very sensitive to gyno, and is very sensitive to the negative effects steroids have on natural test production. what may have happened is that even though this is such a light cycle he may have shut done test production enough in his own body to allow estrogen to become the dominant hormone. bro if i were you i would take some clomid. might have to start rethingking if steroids are for you too if you are already having problems with such a light cycle. its up to you. either way good luck