I did the SHR plus some more trail miles last year from Sep 1-14. Zero bugs. First half was sunny and temps in the 70s. Second half was rainy/foggy and it even snowed, lightly. September is... usually... awesome in the Sierras but can be dicey if a freak system blows in.
But even with cruddy weather. I was fine under a cuben tarp, no bug net. I used a 30degree quilt and was cozy, especially when wearing a lightly insulated wind jacket. Considering our difference in sleeping pad, I had two 1/8 inch foam pads... You should be well insulated from the ground too. I didn't have a down(ish) jacket, but it might have been nice if sitting around camp. I think a couple layers of polypro and a wind jacket are plenty Going solo, I usually slept in, then hiked til dark and went to bed immediately. I didn't have camp shoes or river shoes or anything. I found that my trail runners were comfy enough.
I had super thin gloves that I basically wore the whole time, abrasion protection from rocks and cold protection in the morning. Also granite gets absurdly cold after a night... I might have wanted a bit thicker gloves for those foggy sleety mornings.
polycro is lighter than tyvek
Possibly lose some 1st aid bulk... I had like a pin and duct tape... Or just move the gel and powder to food :P, depending on what kind of gel or powder it is...
I barely used my trekking poles but they were nice when I was on trail. 20 straight miles in Yosemite, some near Mammoth.
Seems like you are doubled up a little on polypro type layers.
I wouldn't mind being out there again this year! Awesome trek.