Yes, I agree with @mamaedefamilia - you shouldn’t even be upset over the John Ervin scholarship. You tried and did your best. That’s all you can do. Just in case you aren’t aware only a handful get it. In my D’s case only one person got a scholarship for her major. It is so hard to just getting into WashU and it is even harder to get the scholarship. You should be very happy you got into both of these schools. That wasn’t easy! In addition, you are receiving huge aid which is awesome. Congrats! 
By the way, all the paperwork is all normal stuff - it is a pain but its worth it in the end.
Also, look closely at the aid offers and compare them. My vote is WashU because you said they will cost you the least out of pocket. Good luck and ask us anything and we will try to help.