Wow! This is fantastic! I did a very quick test with Tinker comparing 2.5.4 and 2.5.5. This is the "normal" i.e. not sleeping mode.
From my original testing the R410 was 15.5 mA. So as you mentioned not only a significant reduction but even signicnat reduction compared to the R410. This is HUGE improvement for my use case! What a fantastic result without having to deal with the complexity of eDRX. Nicely done! Thank you!!!