Help in reduce circuit losses

[GH Crash]

Any suggestions on how to reduce the resistance of the attached circuit.

A supercapacitor (EDLC) is used to power a small motor. There is an ATTiny85 chip in the circuit that is used as a timer and a PWM controller for the motor. The problem that I'm loosing about half a volt between the capacitor's voltage and the voltage across the motor's leads. I need to minimize losses in the circuit as much as possible.

Can you suggest means to reduce voltage loses to the motor?

 

[vidalv]

In addition, you can find why C8 can be used, please read this Toshiba document available here:

https://toshiba.semicon-storage.com/info/application_note_en_20180726_AKX00068.pdf?did=59460

See chapter 4.4.3, could explain this choice.