Hi Hamster,
My wife and I trekked the Tour of Mont Blanc in 2009 and stayed in refuges.

Here is a link to a trip report I wrote: Tour of Mont Blanc

Obviously, this is a different trek, but the similarities seem to be enough for me to comment.

You seem to have kept your pack weight to a decent level. Are you including clothes you will wear? If not I would think that shorts would be a worthwhile addition. Also, could you combine long pants and rain pants?

At that time of the year you may not need long underwear. The refuges provide blankets so you should be warm enough at night.

If you are concerned about the weight of the trekking poles you could take only one. They are very useful especially on steep descents. Also sun glasses are pretty useful at higher elevations.

This sounds like a great trip. As far as lunches go, bread and sausage or cheese is good.

Hope this works out for you.

Dave