After speaking with MS here is the workaround to the issue
The IS caches mailbox information every 2 hours by default, this registry key allows you to decrease that amount of time, so replication of send as permissions occurs more frequently...it did the trick in a lab environment but have yet to implement in production..
To control rereading the logon quotas in the mailbox information cache, change the Mailbox Cache Age Limit value:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
Value name: Mailbox Cache Age Limit
Data type: REG_DWORD
Radix: Decimal
Value data: The mailbox information cache age limit in minutes.
The default value is two hours.
You must restart the information store after you make any of these registry changes. Also, if you set the time-out values to very low values, you may affect the performance of the server.