Hello Nathan! I joined here and put up my heavy gear list, warts and all, about 3.5 years ago. So I know how it feels wanting to lighten up and looking for good feedback, so I will try and return the favor. My list was actually heavier than yours by about a pound.
I am going on a 50km section hike this weekend, and my base pack weight will be around 8lbs, for reference on how I pack now. There is a link to my blog on my profile you can check out if you want to see some of my gear lists. I've been fully converted to UL and now backpacking for me has never been better.
Anyhow, let's begin:
Kelty Lakota 65, 56oz or 3 pounds 8oz -- Very heavy. I highly recommend Zpacks backpacks. I own one with a frame (Arc Blast, 52l, 515g w/two hip belt pockets) and one without (Zero, 33l, 240g, w/foam back frame) and love them both. Golite have some good packs (or at least used to) for cheaper that are around 2lbs. Keep an eye out on the Gear Swap.
REI Flash Sleeping Bag (Men's Long) w/ stuff sack 1 pound 12.6oz -- What is the temp rating? I will again recommend Zpacks here, as they also make great sleeping bags, but they are hoodless. I happen to like bags better without a hood, but you can also get a down hood that does not weigh much. My Zpacks sleeping bag is rated 40F/5C, is wide/long, and comes it at about 430g/15oz. They are pricey, but then again all down bags are.
REI Flash Sleeping Pad (long) w/ stuff sack 1 pound 1.5 oz -- Easy fix, get a Neoair Xlite. Overall the best sleeping pad I have ever owned and is about 13oz and r value 3.2.
Cook system of 29oz is pretty heavy. Cut down by ditching the fork and carrying case, plus the heavy stuff sack (replace with ziplock or Cuben fiber bag). Could either replace gas stove with something lighter, but I am not a gas guy. Or look into alcohol or Esbit. The cook kit I am using this weekend is alcohol and total for pot, stove, wind screen, sponge, lighter, spoon, and bag is 180g/6.3oz. Plus 15g for a small plastic squeeze bottle of fuel.
Water stuff at nearly 26oz is very heavy. Get a Sawyer Squeeze filter, it comes with a dirty water bag, and then take a recycled water bottle. My water stuff is 155g for filter, dirty water bottle, hard plastic bottle for clean water, and a small plastic cup for scooping water (doubles as my tea cup for meals). No need to take two water purification systems in most situations. Remember you an always boil water if you need, but if you must have a back up, a mini-dropper bottle of bleach is lighter, around 25g or so or less.
Shelter at nearly 4lbs is pretty heavy. Sorry man, I know you just bought it and all. I'd look into a big silnylon tarp, which are not too much money (heard good things about Borah gear tarps). Then either get a bivy or a bug net to use under the tarp. An 8 x 10 silnylon tarp is about 12oz, and there are bug nets that are as low as 7 or 8 oz. My shelter system of tarp, bivy, stakes, guy lines, double ground cover, and stuff sacks comes out to a total of 405g/14.3oz.
I don't have much more time, but as for the rest:
Ditch the trowel. Just use a stick, tent stake, or your heel to dig.
Reduce down the FAK and the fire kit.
Your rain gear is also on the heavy side. Look into Tyvek on the cheap, or Zpacks if you have the cash to spare.
Reduce your clothing. Replace button up shirt with a good insulation layer, like a vest or windbreaker instead. And are those cotton shirts?
I hope this helps man, and keep an open mind and don't take this ripping apart of your gear list personal. I'd be happy to answer any questions or concerns you might have. Take care and good luck :)