Lots of good advice you have so far. One thing that might be useful is to tell us more about the environment you hike in. From my understanding Texas can vary from wet and humid, to very dry and arid. Also for shelter advice it would be helpful to know if you use trekking poles or not.
Here are a few things you can do cheap.
You could replace the Marmot Precip Jacket with the Marmot Essence (6.4oz size M) that is on sale at REI or you could get the DriDucks suit and use the jacket (5.1oz in a very large S) that is $15 here.
Replace the Filter with Aquamira drops or tablets. I use the drops repackaged in mini dropper bottles They only weigh 1.1oz and cost would be around $18 for bottles and the drops.
You could save some weight by going to a regular platypus.
Repackage the Insect Repellent in a mini dropper bottle
Make your own first aid kit. I take a kit that has 8 Advil in a “button” ziplock, 2 Benadryl in a “button” ziplock l, 2 Immodium in a “button” ziplock, 3 Feet of Leukotape P wrapped around a straw, a safety pin, a single use neosporen, a single use super glue, an alcohol prep pad, and a blister pad all in a medium ziplock bag. It weighs 0.7oz
You could replace that mini maglite with something lighter. I like headlamps better than flashlights, but there are lots of good lights less than 3oz.
I would replace that compass with something lighter. I use a 1.3oz Sunnto M-2 but there are a lot of nice compasses out there in that weight range.
I am not going to tell you not to take the GPS, but they are not needed in many places.
Replace the Multi-Tool with a Mini Gerber LST (0.6oz), Spyderco Ladybug (0.6oz), or Swiss Army Classic (0.8oz).
I take toilet paper, but 2.5oz of toilet paper is A LOT! That is almost a whole roll!