Wild camping comes with a lot of extra kit to carry.
Your tent, sleeping bag, mat, cooking equipment, more food and sleeping bag liners can all add up. The one thing you really do have control over is the food; this sounds obvious but don’t take tins, cans, glass jars, or anything that doesn’t crumple down. Yes, I do know people that have carried cans of soup on camping trips, and no that 500 gram block of cheese you thought was a great idea two days ago is not looking so great now. Remember you also have to carry your litter!
Also, trying to be ultra-light is fine but sort your priorities out; there’s little point cutting your toothbrush in half to save weight when you’ve crammed in that hardback of War and Peace you’re not going to touch other than on the train.