What you have is a traditional list for backpacking. In order to drop your pack weight you need to rethink some of your packing decisions. Going lighter really is a learned skill. There are many experts and article here on BPL that can help you along the way.
I started out with a list much like yours. Each year I would try a new item or technique to get the weight down. In August I went out with 8 days of food (including a bear canister) with 25 total lbs. For a 3 day trip I can start out with no more than 15 lbs. It really makes backpacking much more enjoyable, and in the opinion of most, much safer.
I started with my shelter, then my sleeping bag, and then my pack, cooking system, etc. It is a process. If you hike in the Sierras learning these techniques will really enhance your backpacking experience.