Great write and Pictures a great 1st post
welcome to the forums.
As for lighter bergen, a good way to start is list the items you used, the ones not used but necessary (i.e. first aid kit) kit taken and not needed form the lists you should be able to lighten your load. remember food and water are also sometimes the heaviest items in your pack for size, some go for dehydrated meals to lighten load (especially on long trips) or try things like pastas and rices (try to find or plan in local water sources or rain capture to ease the burden ) hope this helps