How do I change maxBufferSize & maxReceivedMessageSize in WCF Wrapper service?

Question

From my Silverlight 4 project, I have a call to a WCF service which is accessed via a wrapper service. This is just a WCF Service Application with a Service Reference to my other WCF. I am getting the following exception:

"The maximum message size quota for incoming messages (65536) has been exceeded. To increase the quota, use the MaxReceivedMessageSize property on the appropriate binding element.".

While debugging I see:

ProtocolException was unhandled by user code -- The remote server returned an unexpected response: (400) Bad Request.

In Silverlight, a 404 response code may be reported even when the service sends a different error code.

I am using Silverlight 4 & .NET 4.0.

I can change maxBufferSize & maxReceivedMessageSize to 524288 in the WCF Test Client to see my expected results.

How can I change these values so that they are actually used instead of the WCF default settings?

Wrapper Service web.config:

<?xml version="1.0"?>
<configuration>
  <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_IMyService" closeTimeout="00:02:00"
          openTimeout="00:02:00" receiveTimeout="00:10:00" sendTimeout="00:02:00"
          allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
          maxBufferSize="524288" maxBufferPoolSize="524288" maxReceivedMessageSize="524288"
          messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
          useDefaultWebProxy="true">
          <readerQuotas maxDepth="524288" maxStringContentLength="524288" maxArrayLength="524288"
            maxBytesPerRead="524288" maxNameTableCharCount="524288" />
          <security mode="TransportCredentialOnly">
            <transport clientCredentialType="Windows" proxyCredentialType="None"
              realm="" />
            <message clientCredentialType="UserName" algorithmSuite="Default" />
          </security>
        </binding>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://internal:51505/SvcApp/MySvc_MyService.svc"
          binding="basicHttpBinding"
          bindingConfiguration="BasicHttpBinding_IMyService"
          contract="WCFServiceRef.IMyService"
          name="BasicHttpBinding_IMyService" />
    </client>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
</configuration>

Web project web.config:

<system.serviceModel>
  <bindings>
    <basicHttpBinding>
      <binding name="BasicHttpsBinding_IMyWrapperService" maxBufferSize="524288"
       maxReceivedMessageSize="524288">
        <security mode="Transport" />
      </binding>
      <binding name="BasicHttpBinding_IMyWrapperService" closeTimeout="00:02:00"
       openTimeout="00:02:00" receiveTimeout="00:10:00" sendTimeout="00:02:00"
       allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
       maxBufferSize="524288" maxBufferPoolSize="524288" maxReceivedMessageSize="524288"
       messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
       useDefaultWebProxy="true">
        <readerQuotas maxDepth="524288" maxStringContentLength="524288" maxArrayLength="524288"
         maxBytesPerRead="524288" maxNameTableCharCount="524288" />
        <security mode="None">
          <transport clientCredentialType="None" proxyCredentialType="None"
           realm="" />
          <message clientCredentialType="UserName" algorithmSuite="Default" />
        </security>
      </binding>
    </basicHttpBinding>
  </bindings>
  <client>
    <endpoint address="http://internal/mysvc/MyWrapperService.svc"
              binding="basicHttpBinding"
              bindingConfiguration="BasicHttpBinding_IMyWrapperService"
              contract="WrapperServiceServiceRef.IMyWrapperService"
              name="BasicHttpBinding_IMyWrapperService" />
  </client>
</system.serviceModel>

I have seen suggestions to name my serviceBehavior and add maxItemsInObjectGraph.

I tried adding "LargeEndpointBehavior", but this did not seem to do anything.

<client>
  <endpoint address="http://internal:51505/SvcApp/MySvc_MyService.svc"
      binding="basicHttpBinding"
      bindingConfiguration="BasicHttpBinding_IMyService"
      contract="WCFServiceRef.IMyService"
      name="BasicHttpBinding_IMyService"
      behaviorConfiguration="LargeEndpointBehavior" />
</client>

<behaviors>
  <serviceBehaviors>
    <behavior name="LargeEndpointBehavior">
      <serviceMetadata httpGetEnabled="true"/>
      <serviceDebug includeExceptionDetailInFaults="true"/>
      <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
    </behavior>
  </serviceBehaviors>
</behaviors>

Do I just need to fix my service wrapper web.config?

The service that I'm calling via the wrapper, the ServiceReferences.ClientConfig in my Silverlight project & the web application which hosts my xap file have all values maxed out.

Any suggestions?