Increase simultaneous Move-Requests from Exchange 2010 to Exchange 2013

Does Anyone know how to increase that? It seems like its moving only two mailboxes at the same time and its terrible slow.

source server is exchange 2010 and the number there of simultaneous moverequest has already been increased per "MsExchangeMailboxReplication.exe.config".

i tried the same in the target exchange 2013 server but it already has higher values as you can see:

C:\Program Files\Microsoft\Exchange Server\V15\Bin\MsExchangeMailboxReplication.exe.config

 <MRSConfiguration
    MaxRetries="60"
    MaxCleanupRetries="480"
    MaxStallRetryPeriod="00:15:00"
    RetryDelay="00:00:10"
    MaxMoveHistoryLength="5"
    MaxActiveMovesPerSourceMDB="20"
    MaxActiveMovesPerTargetMDB="20"
    MaxActiveMovesPerSourceServer="100"
    MaxActiveMovesPerTargetServer="100"
    MaxTotalRequestsPerMRS="100"

thanks alot!