I will look into the dynamic fee code when I get chance, but I do think the best way to go now in the meantime is to release an update with the 0.02nbt fee. I might be able to do that later today, though I am busy.
When Nu 2.0 was released, I had no warning beforehand. The primary concern at that time was to disable the bloom filtering to ensure the app was compatible. I did at first read about the dynamic fees, but considering the chaos at the time, I forgot about them and the present day problems did not occur to me.
To ensure NuDroid is compatible with future Nu versions, I should always be given advance warning and presented with all of the protocol changes so I have time to go through them and plan an update, with enough time to obtain the funds and develop the changes to the app, before any protocol changes come into force. This also applies to other developers, or project managers of Nu-related software.