As many others have mentioned, you are in for a pleasant suprise as regards "seeing the light." Most of the forum members here have three-season baseweights (weight of carried gear minus consumables) that are 15 lbs or less. Many are less than 10 lbs, and a few are under 6. And we don't get wet, hungry, cold, or any of the other things some traditional backpackers accuse us of. Lightweight and UL backpacking is about reducing the suffering, not adding to it!
I would expect that, considering the weight of your listed items, there are a number of redundant/unnecessary items in your pack. This is a good place to start. Make a gear list of everything you'd take on a trip of given length and conditions. EVERYTHING. Consider what you actually use, might use, and would never use. Think about the quantity of things you take. Too many spare clothes, too much stove fuel, FA supplies, repair materials, etc is just dead weight. I've seen people with a 100 ft of paracord, a big roll of duct tape, an FA kit sized for an expedition, and a spare 10x10 tarp, just in case. In case of what? What's going to happen on a three day trip? Post that list here and let the forum critique it. You'd be suprised how much the little stuff weighs; ounces add up to pounds. On that note, GET A SCALE! Seriously! An accurate scale is important to this process.
As has been mentioned, reconsider the bivy. Bivies are very challenging to use in real-world conditions. The only time I carry a storm bivy is on fast overnights where I hope I won't have to use it. A Tarptent is much more useful for most backpacking, especially in the SE. It seems odd, but WPB bivies are terrible rain shelters; they're much more user-friendly in snow. Tarptents are easier to ingress/egress, allow you to change clothes, give you some space to segregate wet and dry gear, and are much less stuffy and condensation-prone. Not to mention, the idea of being pinned down in a bad storm in a bivy is horrible. You'll go insane, and you probably won't even stay dry for your troubles.
There are a number of items you can make or purchase for minimal cost that will be much lighter than what you're currently using. Try making a catfood can alki stove. Weighs an ounce or so, cheap, and not much more fiddly than a Whisperlite. I like coffee, so I use a Snow Peak canister stove. Weight is 3 oz., fuel weight is a wash, and I have water boiling usually before a white-gas stove is even lit. Pick up a cheap pot from AGG or a walmart grease pot. If you really wanna shock yourself, weigh all the stuff sacks and such you normally carry. If you can sew, make up some silnylon stuffsacks. If you cant's sew but want to learn, buy a machine, get someone to help you set it up, then practice by making silnylon stuffsacks. Then get some EPIC from OWFINC and make some 4-5 oz WPB rain pants.
I can respect your wanting a synthetic bag, but personally I prefer down. After 30 years or so, I've never gotten one wet, and I've only had loft-reduction problems a couple times, both of which were operator error. Down is lighter, more compressible, and has a much longer service-life. I have a Moonstone down bag that's pushing twenty years old and it still has plenty of life. Down also is more comfortable; I find it both warmer and cooler than synthetics. I always feel kinda slimy after a couple of nights in a synthetic bag.
You've got alot of good tips from some pretty experienced UL packers, so this will give you a few days/weeks of homework. Get that pack weight down and we'll start hammering you on lighter footwear. Before you know it Mike C! will have you convinced to leave the TP behind.
Welcome to the LIGHT side Ben!