Experience with Klymit UL Pads in Sleeping Bag?

[PathFinder]

For a bit of background, I've been running a mix of down and synthetic 30*-10* quilts with an X-Therm pad for the last 4-5 years. I love that combo and I'm sticking to it for 80% of the year, but now I'm putting together an extreme weather sleep system. My plan is to go from a floorless shelter to a 1 man Hilleberg (Akto or Enan) or TarpTent (Bowfin 1 Solid Interior) for extreme cold and weather when I'm solo. It will be used whenever there's a significant amount of snow (2"+) and the weather sucks. Any time from October-February. I love the idea of a Sawtooth and stove but I'm not packing it all solo, and I hunt solo most of the time.
I'm debating between three different insulation options. Definitely going synthetic for insulation, just because crap happens. I've never had a down quilt totally go flat, but I've had them head that direction over night. The three options are a Kifaru quilt, Body Bag, or 20* slick bag. The Klymit pad option will be the deciding factor for me. Do the loft pockets on the Ozone and Inertia X-frame allow the sleeping bag to take the place of the insulated pad, or is it not that effective? If I have to continue to pack my X-therm, I'll just stick to a quilt. If the ultralight Klymit pad will work inside the Body Bag or Slick Bag, I'll probably go that route. Anyone have experience with those pads and their "loft pockets?"

 

[sneaky]

October-February is when down shines compared to synthetic. Rain is the enemy of down, not snow. There's a reason there aren't any synthetic bags on mountaineering expeditions. Down is king during the winter months. As for the klymit pads you mentioned, I don't think either of those are an insulated option I would choose during the winter months. I would recommend you stick with an xtherm, a Soulo over either the Akto or Enan, much more bomber tent. Also, there's a TarpTent Moment DW for sale here in the classifieds that has the crossing pole for snow loads.

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[PathFinder]

I know what you're getting at with down for winter. I've got a 10* down quilt I use when it's that dry kind of cold. This setup is intended to be a totally failsafe system. Most of its use will be during late season mule deer hunts when precipitation is often a rain/snow mix and temperatures range from 10* up to 60*.
I did more research on the Klymit pads, and it looks like they aren't going to work out. I'll either end up with the Kifaru quilt or a VIAM 10*.
Any reason an Akto wouldn't be up to the job? I have zero experience with Hilleberg products, I haven't used anything but a tarp or tipi for 4 years. The Soulo is way out of my weight range. The Moment with the cross pole is intriguing, I guess that's what the Akto is lacking for snow loads.

 

[sneaky]

You said failsafe. The Soulo is failsafe. I'd trust it far and above the Akto. You could run it with or without the inner tent, saves a couple pounds that way and you have a bomber single wall tent. I was just recommending fail safe options lol.

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