When I hiked in Finland my pack weight was around 4 kg excluding food, for autumn Lapland trips, temperatures hovering around zero C. 800g tents and sleeping bags, titanium stoves, PacLite shell, 2/3 cut sleeping pad etc, the works (I did equipment reviews for outdoor magazines). That was 15 years ago, now I already have one artificial hip joint and other one is going, so no loads for me. In Nepal I do like the Nepalese do: I can afford porters, thus I employ porters, and need not save weight.
If you are going to visit Dolpo and other restricted areas you will not be able to hike at through hiker speeds, as porters and guides can not keep up, like you said.
I'll check the batteries, so far the Fuji originals have not performed very well. With Nikons (D800 & D4) I get at least twice as many shots per charge.