I don't think I fully understand the description of your problem... but I will try to explain how this feature works...
After you turn on Battery Care, the phone will learn your habits for a few days (it could be 2 or more days) and if your routine changes from time to time, the Battery Care feature will not activate automatically.... however if the phone picks up your routine or similar.. it will turn on the feature and let you know with a notification (you can also dismiss it and change to regular charging if you need the device charged earlier)
The Battery Care will usually stop charging at 90% and it will aim to reach it about 30 minutes before you wake up (sometimes this happens according to your active alarms). After that, it will finish charging and reach 100% close to your alarm time.
I would advise you not to worry too much if the feature activate or not... and just use your device normally...
What I do is I have a QuickCharge 2.0 Sony charger that I use during the day if I need juice... and then at night I simply plug it in the standard 1.5amp charger that came with my unit. This way I know I will charge slowly at night either way.
Also, QNovo tech is supposed to take care of your battery charging and discharge cycles even if Battery Care is turned off.
