After not changing for 1500km my deterioration counters suddenly jumped yesterday.
I have driven 9800km in 7 months.
Before Yesterday: max 3.5% min 0.1%
Yesterday morning: max 4.5% min 4.4%
Yesterday evening: max 5.5 min 4.4%
I assume this is a calibration effect rather than something I did yesterday that caused deterioration to happen suddenly.
Whatever these numbers mean my car is now fairly similar in rate of deterioration to yours.
Yesterday I drove over the mountain on the fast road to record recuperation effect.
I drove 49km using 7.2kWh off the battery and recuperated 2.6kWh.
For this trip I got 27% of the energy from recuperation.
My car has a driving info screen under the UVO settings. I don't know if any of you have this function. Here is the display.

I also posted this message on the German forum under the OVMS thread. That thread is quite busy and useful. http://www.goingelectric.de/forum/kia-soul-ev/ovms-fuer-den-soul-t9741-130.html