There's too much on that belt kit. It's fighting order, you need ammo, water, first aid, if there's any spare room a meal or two from a rat pack.
Remove at least two of the large pouches, remove the right ammo pouch (you only need 6 mags)
This should leave you with ammo pouch on the left, water bottle pouch on right with one of the large pouches also on the right. This remaining pouch is for your first aid kit - first field dressing and CAT, leaving plenty of room for a grenade. Leave your water bottle cup in your day sack and you'll have plenty of room for a couple of meals.
You don't need a full cleaning kit, just your combi tool and pull through, stick them in your top pocket. 180rds weighs approx 3kg, so stick 3kg of bagged sand in your ammo pouches. Then wear it, test and adjust so it's comfortable, get in the prone position (lay down) to make sure nothing digs in. Make sure nothing rattles and nothing falls off.