Kevin,
I'm a fairly warm sleeper, and I often feel heat loss through my Synmal UL7 at about 35F. I use a 1.7 oz 19" x 16" piece of 1/4" thick CCF under my hips to torso. It's a piece of military surplus sleeping pad. It's also my sit pad, and it would work well for a backpack back pad or to add stiffness even though I don't use it for that. I generally keep it where I can get to it easily for breaks.
Also, use some type of inflator rather than lungs to inflate because that adds heat-draining moisture.
Consider using either a sleeping bag or light bivy to hold in heat.
Sleep under the best tree/brush cover you can find.
Are you sure you really need a 10F/2 pound quilt? I think you might be able to eliminate the down hat and booties. Do some backyard testing, or carry them without using them unless really necessary.
At those temps with a low of 25F, this is what works for me in wet conditions:
* Synmat UL7 with sit pad on top in hips/torso area
* Montbell #3 Super Stretch UL sleeping bag (800 fp down, 21 oz, 32F rating)
* thin polyester short sleeve t-shirt
* thin micro fleece jacket
* synthetic 70g jacket (Golite Cady, used for breaks, sitting around, rest stops, sleeping if below 34F, pillow otherwise)
* maybe thin polypro base layer pants for sleeping, but I could use the fleece jacket around my legs
* fleece beanie
* warm, dry synthetic or syn/wool blend socks
* wool or fleece glove liners
* DriDucks rain jacket, maybe eVent Packa (integrated jacket/pack cover)
* probably no rain pants, although I plan to make a pair of silnylon chaps soon
I just used this combo minus the synthetic jacket down to 35F last month with rain, light wet snow, breezes/shifty blowing both under my tarp, sometimes getting my bag and pad wet in spots. (The bag's awesome DWR kept the down dry!) I was plenty warm and had a blast sleeping out in these conditions!
Lastly, if an item keeps you warm and comfortable, don't cut it. It's worth the weight!