I like to carry a whistle, small button-sized compass, firesteel, coin cell LED light, and knife on-person in case of pack loss.
You can probably get by with a lighter quilt for 30F and above?
Can you trim some weight from the Ohm? I removed the frame, hip belt, and sternum strap of my 24 oz GG Gorilla without any permanent changes, resulting in a 16.7 oz pack. With a lower pack weight, I actually like the fit better without a frame and hip belt.
Even lighter than a Gatorade bottle: A 1 liter Platypus is 0.9 oz. The 1 liter carbonated/fruit-flavored water bottles from Target are 1.2 oz.
Don't forget the sunglasses until the trees leaf out.
A head net is nice, even when using repellent. Gnats like to fly into eyes, ears, and nose.