iHeart Radio Power On Volume

I'm probably missing something simple here but if I'm listening to iHeart Radio through Entune every time I turn my car on and it'll resume playing iheart radio but it starts up at volume 9. If I turn it down to a 5 then turn off just the audio then back on again it comes back on at volume 5, but if the car is turned off then on again it's back to volume 9. I know I can turn the Bluetooth volume down on my phone so level 9 doesn't blow my ears out before I turn the radio down but it seems silly that it just won't remember the last volume setting. It's like volume 9 is hard programmed into Entune when the car is power cycled. Does anybody know how to change the boot up volume for Entune?