Alex, from my middle of the night research, I found this Utube video on Stylus adjustment, it might help.
https://m.youtube.com/watch?v=uC3ZHroezM0
There is a sensitivity adjustment inside the Pen, which requires disassembly to access, but details are shown. It might be a good idea to source a backup or replacement stylus. I assume some sort of calibration routine is required.
Good luck.