Most likely the seeking credit factor with experian, something similar happened to me a year and a half ago after my first spree where my experian went from 738 to 690 three things happened at the time were the seeking credit factor showed up and also my aaoa took a significant dip, and the multiple inquiries all added up. I suspect the same for you as my aaoa was around where you're at currently after my first spree went by. The good news is let those cards mature and it'll bounce back in a few months as well as your aaoa, as your file thickens and ages it'll be harder to feel the effects of app sprees down the road.