Chris ,
I took another look at your voltage readings.
The 5.13 volts PIN reverse bias voltage looks very low! It should be higher than that in receive mode, and much higher in transmit mode as the TX RF derived boost kicks in. Check over the voltage doubling bias circuit very carefully.
What PIN? reverse bias voltage do you see in RX mode? It should be close to your power supply voltage .inus a diode drop.
JZ KJ4A?
