Climashield APEX / XP 2.5 UQ question

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I am about to dive into a new project using Climashield APEX and 2.5 in combination. Main reason for both is because I have the XP already.
Below is what I was thinking. The end with the APEX would be the head end.

I would like to be able to get down to 30˚F with a bit of supplemental clothing. I have a 30˚F TQ that will be in the mix as well.

Ok so I need some opinions from the pros. My understanding of warmth to loft and such are limited but from what I have read this setup makes sense to me. Do you guys see any short comings or have any suggestions?