Wheel Balance

Hello Everyone,

Been having an annoying issue in my 17 Volt. It seemed like the tires were out of balance, I made an appointment at Discount Tire and had them rotate and balance. I can tell they made some changes due to new weights on the wheels. However, I'm still feeling the thumping or whatever you might want to call it. Just wanted to get some opinions...should I take it back and tell them that, or do you think it could be something else? I'm taking it to the dealer tomorrow for the most recent recall, so if it is something the dealer should handle, I could mention it to them too. Has anyone else had this issue?

Thanks!