Sofirn SP10 Pro Memory Mode?

I've managed to get the SP10 Pro into "Advanced UI" which was changed from the default "Simple UI".

The user manual supplied with the light has extremely small print and is not quite detailed enough. 

Despite the manual shortcomings I've managed to get the light levels changed from "Ramped" to "Stepped" mode. I notice that there are a total of seven light levels within the stepped levels. Can the number of stepped levels be changed?

The Memory Mode function is a bit odd. Initially the memory mode remembered the moonlight level setting after switching off the light and then switching the light back on. But I tried switching the light on again after a few minutes or so, but this time the light level had jumped up maybe a couple of levels brighter!?

I tried fiddling with memory mode timing (apparently there is a timer for how long the memory mode lasts?), but still get strange results. This time I set the brightness level a bit higher, but on switching the light off and then back on again shortly after, the level had dropped to the lowest level (moonlight?)!?

I would expect the light to save/store the brightness level that was set just prior to switching the light off. And on switching the light back on, the same light level would be restored. But this is not happening correctly.

How can I get this light to restore the last used brightness level when the light is switched back on (regardless of length of time between light switch off and then switch back on)!?

Thank you.