@sslupsky – replying here instead of continuing the discussion on github
I haven’t made extensive research for low power, but I doubt I would make it better than you.
As @sebbad mentions the current draw most probably comes from the Murata module, and we have no impact on that.
I decided to workaround the problem with a TPL5110 and I am very optimistic with that – I need to control power anyway for my sensors.
Linked to that I have submitted some simple merge requests to support “ABP after OTAA” and externalize additional data through the Library.
It is pending review, but if you are interested my Library and firmware are available here.
The firmware is labeled 1.1.6-B02.
It is working fine for me, I am still looking at one additional feature: currently there is (afaik) no way to know when a send is complete (unless you ask packet confirmation which I don’t want), so I need to wait a couple of seconds before cutting power to ensure the packet is sent.