I'd second the motion on getting a Revelation X quilt from enLIGHTened equipment. I have not experienced the Revelation in person, but I got a Prodigy X (their synthetic model) for cowboy camping and it's great. Both their down and synthetic bags are an excellent balance of weight:quality:price. But if you are OK with down and you are really shaving weight, go for the down of course. The 40 degree one is around 18 ounces for $175. If you want to really go wild, Katabatic Gear makes a 15 ounce 40 degree bag for around $400.
Also getting a lighter tarp would probably serve you well. I have a double-walled two-person tent that weighs about the same as your tarp. Can't advise on specifics, but those lighter tarps are out there! MacCat makes some reasonably prices light ones. See this thread:
Then once you've lightened up your load, you can probably get away with a pack with fewer whistles and bells. I know MB just warned against this, but I've been very happy with my GoLite Jam. I've been carrying about 18 lbs in it and could probably do more comfortably. In my experience, it seems like just about all packs have too large a volume relative to their support features. So just don't be tempted to fill it up. Alternatively, you could see if you can get away with the 35 liter. I'm sure the Mariposa and Gorilla are really nice packs (I have eyeballed them), but you can get a Jam so cheaply it would be hard to regret it. Just depends on your budget to some extent. Whichever way you go, replace your pack last so you have a nice light load to put in your UL pack!
If you get any of this stuff (maybe even if you don't), I'd highly recommend replacing your DEET with a picaridin-based bug repellent (at least 15%). It won't damage your gear like DEET.