RP2040 LoRa Low Transmit Power

I’m experimenting with a Waveshare RP2040 LoRa module which is working fine functionally as a node but it has low transmit power (+10dBm) when measured on a HP spectrum analyzer. A Heltec on the same instrument measures +20dBm output.

Initially, I thought that I had damaged the module, so I bought another one. It also has the same transmit power.
I’ve experimented with region and power settings on the module and +10dBm is all it will do.
Also tried the latest 2 Beta and Alpha firmware too.

Does anyone else have the same module and have they measured the transmit power?

Glenn.