You can lose another 100g per tube for not much money…
Not many tyres that grip under 500g, Specialized tyres have decent volume and light weights, Adrenalines are pretty good allround tyre, but dont bother with over 2.0 as they come in huge.
Wheels are a good way to lose weight, but you have decent hoops already, its expensive to change, do it when you have worn out the wheels you have.