Was this a new install? Not sure if Dish changed you from EA to WA as an existing customer, or did WA as a new customer. Don't know why they would change arcs for an existing customer.
No wing Dish scenarios are currently supported, a new DPH42 switch to be released SOON will be needed. Even then Dish may not want to support mixed arc scenarios.
If the tech thought it was line of sight issues and he was that new, I'd try and get a more experience tech out there to look again. I've been told on two installs there was no LOS, and had to tell the tech "yes there is" and show them where the dish needed to go.