Keep in mind that different exercises do different things. If you can do your flies on flat, incline and decline you can make well rounded progress still. Your pecs attach at your collar bones(incline), sternum(flat), and ribs(decline). So try to find movements to work all those angles without...
I'd be concerned. It's better to get that shit under control before you have actual lumps to worry about. I'd up your ai dose like wolfpack said and if that doesn't do anything I'd start to question the quality of your ai. That's not very much test to be having an issue like this. Where you are...