Assuming you don't have anything left to gain fitness and skin toughness-wise, I would start by getting rid of the toilet paper and using moss, which simplifies things a lot. The down mat also seems heavy. I don't think you need such a big pad. So there's about a half pound saved.
If you have the Houdini, you don't need the nylon shirt nor the neck flap of the OR hat; you could bring a visor instead, like their Radar Visor, which folds up.
What about gaiters for keeping debris out of your shoes, esp. when crossing rivers and streams? OR Sparkplug gaiters are 1 oz.
I wouldn't worry about shreding your light rain pants because you'll get wet anyway, and your pants will get shredded eventually, so just go for it.
I would bring the fleece over the down for warmth when going through the car wash ( wet willows), and take the heavier hooded synthetic jacket for drying your clothes on the move.
If you already own it, I would take the Ultamid for interior gear explosion space and ease of setup.
I think you can skip the bug tent due to cold temperatures.
https://youtu.be/7MOQj49jcPM
Have fun and post pictures!