A few things.
+++1 for ETB's JMT Atlas and trekking poles. I have the GG LT4s and really like them. Anything to help take the stress off your leg joints will help over time given the rugged ups and downs.
I also have a Patagonia Houdini and really like it. However, for the JMT I took my rain jacket (Montane Minimus) and was glad for it given how much bad weather in the form of rain, hail, snow (and not to mention how cold it can get) we had last August. So, I would recommend a rain jacket versus the Houdini wind shirt, which is only water resistant.
Love your pack choice, except that you may want to see which, if any, bear can you can get in it, along with all your other gear. I used the BV450 and had no trouble getting it into my GoLite 50L Pinnacle pack, but the GG Kumo is a smaller 36L pack. Further, with my food and resupply choices, I had no problem getting in 10 days worth of food for the last stretch between MTR and Whitney Portal, especially since every place in SEKI does not require a bear can. Nonetheless, most people I ran into had much larger bear cans like the BV500 or Bearikade and a lot more food than me, so it's worth checking to see if your bear can will fit in your Kumo. For me, I resupplied at Tuoleme Store, Red's Meadows Store and Hiker Barrel and then I sent a small 2.5 gallon bucket to MTR. And like most people, I sent too much stuff to MTR. By mid-August, the many, many hiker barrels were indeed overflowing.
A few minor tidbits. You may not need both the BG knife and the multi tool. Also, unless you're planning on going off the JMT, you may not need the compass, especially if it's bigger than the tiny button style. You may not need the solar charger. You should be able to charge your phone at Tuolome and Red's. A spare battery may be more useful depending on how long it takes your charger to work. On both the JMT and CT, absolutely everyone I came across carrying a solar charger each said it was their biggest regret for bringing as it was finicky, inefficient and just not worth carrying. Finally, for hydration, you will rarely if ever need to carry more than one liter.
Hope this helps! Enjoy!