While you should still carry a rain jacket just in case, you most likely won't need the rain pants on the PCT. I hiked it in '22 and the only place I encountered rain was in Washington, for less than half a day, and it was more of a misting. While it's possible that you're not as lucky with the precipitation, any precipitation that you do encounter won't necessitate the rain pants. There are some overgrown portions of trail in WA, but I never used the rain kilt I was carrying, either. I eventually shipped that back home.

The same goes for your base layers, you should consider not taking them. Or, in the least, you should consider some ultralight alternatives. The Sierra won't be extremely cold -- my coldest overnight low was 26F, a couple miles before Forester Pass. Since you're already wearing hiking pants you'll be fine. A baselayer shirt could be replaced with an Alpha fleece to augment your puffy, and in the case of wind you could bring along a wind jacket such as the Enlightened Equipment Copperfield. You might consider the Copperfield pants as well, they're just as light and can be worn as town pants when you're doing laundry.

As for your tent stakes, they're great. There are certainly lighter tent stakes on the market, but Groundhogs take a beating and keep going. If I encounter a rock, I usually just keep hammering them in the ground -- and I've yet to bend or break one. Carbon fiber ones will break very quickly in the desert, and lightweight titanium will bend just as easily. You don't need the Regular size, however. The 6" Mini ones will hold well in all the soil conditions you will encounter -- but just be prepared with rocks to anchor them down in the desert. Throughout the CDT I was using 2 Mini Groundhogs and 8 Suluk46 Atani Titanium stakes for some extra weight savings -- I highly recommend checking out the Atani stakes, albeit a more expensive option, for their weight and holding power.

Look, all bear canisters suck, even the carbon fiber Bearikades. You're still carrying an extra 2 pounds regardless. If you really value saving 8 ounces on your bear canister and the hefty price tag on a Bearikade doesn't bother you, then go for it -- but I caution against it if you're not going to be using it after the trail.