Hey Skweek,
Didnt want to read and run, I've never had the coyle so not really sure on it, but I did get sore boobs after coming off the pill and I started taking evening primrose oil for cervical mucus and noticed that my boobs arent as sore now, didnt realise there was a connetion until one day i was talking with my friend and i mentioned that they werent as sore anymore and she said to me that evening primrose oil was prescribed to her for sore boobs!
Might be worth giving it a try xxx