So, far, it looks like I have a bunch of little changes and a few bigger ones to make. This isn't an exhaustive list, but here's some of the things it sounds like I can do:
-Ditch the bowl, as it isn't necessary at all. It was a holdover from previous trips when I cooked with a group and needed a separate bowl.
-Ditch the pot holder. I've got enough things I can grab pots with that I don't need it.
-Cut down the ground sheet, as right now it's way too big and thus heavy. It's actually 0.5 mil painter's plastic, so once I cut it down (to probably less than 1/3 its current size), it'll be much better on weight.
-Swap the Nalgenes for disposable water bottles (probably 1L gatorade or smartwater bottles, as I like the size/shape of those).
-I'll probably swap my really heavy rainjacket for the much lighter DriDucks. I've been meaning to do that for quite a while and just never got around to it.
-I forgot to list the hat and sunglasses; I'll find it and update the spreadsheet sometime soon.
-I didn't think about the bear canister issue. I'm really early in my planning for the JMT and this is mostly my list for other trips (where I don't need a canister). Thanks for reminding me that I need one for this trip.
-I don't know why my stakes are so heavy in this spreadsheet. I think I'll re-weigh them and the tarp separately, as they should be fairly light (GossamerGear titanium stakes).
-I don't have a fuel bottle yet, as I haven't decided what I'm going to use for that. It'll probably end up being a disposable water bottle that's a different color from the ones I'll use for water.
-At some point, I plan on doing a MYOG quilt which should come in significantly lighter than my current bag (haven't decided on the exact design or materials yet). Until then, I'm going to keep using my Kelty bag.
EDIT: Oh, and I can repackage my Camp Suds into a significantly smaller package. I don't need the whole bottle, so taking a smaller bottle of it should save weight as well. I might do toothpaste dots as well, but I couldn't get it to work the last time I tried.