I've updated the diagram to reflect the latest changes in the RF paths / equipment. The main change is the way the output power is measured. In the new configuration I am using one watt-meter for output-to-antenna power and another watt-meter for the output-to-dummy load power. In the old configuration, each amplifier had its own dedicated watt-meter for the output. In addition, the main high-power dummy load is now an oil-filled Bird 8201.