Every pound extra that you lug around up and down the hills is a killer. I lived in the mountains here most of my life, and when I was younger it really didn't bother me so much. Now I've even gone with a 12 oz lighter sack, and you really can feel it after a couple days.
I don't blame you for being upset, as you specifically bought the rifle because of the weight issues. Plain and simple.
As for the new stock, you can modify it to compensate for barrel expansion, and there are other ways to eliminate weight in the stock as well. And you should be able to get a decent price out of the accustock, should you decide to sell it.
But it's just common sense-if you carry 3 things that weigh 2 lbs. each, that's 6 pounds. If you can cut that weight in half, you will save yourself some toil. Period. Not all of us are superman. Used to be, lol.......