Set the 'Log Sync Interval' and 'Log Minimum Delay Request Interval' to -6.
Log Sync Interval: Logarithm, base 2, of the interval between Sync messages in seconds. Values: -128 - +127
Log Minimum Delay Request Interval: Logarithm, base 2, of the minimum permitted mean time interval between successive Delay_Req messages. For multicast and unicast without negotiation, this value is translated into frames per second and used for the transmit rate. Values: -128 - +127