On my Stance I'm getting 80 - 100kms depending on conditions. That's mostly gravel, light trails, and pavement using mostly level 2 assist. I'm about the same weight.
A couple of weeks ago I went through a very muddy section. The next day it looked/acted like concrete all over my forks, rear shock, seat tube, and battery.
I took my hose to the non electrical parts and very briefly blasted most of it off including the rear shock area.
The battery I took inside...
One option is to change the stem to something that you feel is more comfortable.
For me the answer was to change the handlebars to have a 20mm more rise.