Update! I was able to try on the Hawx Ultra 115 BOA and they are about the same volume-wise as the K2 except the heel seems narrower. The flex feels more workable to me and it is scads easier to get on even with the ZipFit. I ended up exchanging the K2 for the Atomic. Things I like: adjustable forward lean--default is 15 degrees. I will start there and may try the 12 for kicks (read: I'll try the 12 degrees. My husband calls me Tinker Bell because I like to tinker with boots, bikes, etc. I tell him I'm gathering data.) The cuff has clearance above the foot part of the boot, meaning the lower cuff is not sitting right on top of the boot, which is an issue in smaller boots and can "block" the full flex of the boot. This might be why it feels more "pliable" to flex. The liner has a removable tongue. I have a feeling I will end up using the ZipFits, though, because they feel like a dream in this boot. Downside: The power strap is attached with rivets that have to be punched out vs. just using a hex, and the stock power strap does not have any elastic. I have Atomic dual elastic straps that I would like to use, so I will have to get some bolts and pop the rivets and hope that nothing gets damaged. The ZipFit tongue also feels very snug in this boot, which is not how it is in literally every other boot I've used them in. I have been a hater of ZipFit tongues because they leave a gap in front of my shin. They are snug in this boot. For those who have never skied in a ZipFit, the heel hold and precision/control is unlike anything else. I think this is where the "they stiffen the boot" comes from. They don't change forward flex, but they do enhance the lateral control which with narrow feet I think is a huge bonus.
Instep seems similar to the K2 but I have less pressure there than in the K2s so that tells me it might be a tad higher? I am so used to crushing my instep to hold my foot, I'm not sure how I'll survive not torturing my feet several days per week.
Interestingly, my feet have "grown"! I had a feeling because my athletic shoes all seem a little shorter, especially on my left foot. Sure enough, I am measuring a 24.5 on the left and still a 23.5 on the right. The fitter asked if I was sure I didn't want to try a 23.5. LOL no, thank you! My left toes are at the end of the boot, but it's still nothing like they were in the 21.5.
Bonus: Black boots match everything.
Instep seems similar to the K2 but I have less pressure there than in the K2s so that tells me it might be a tad higher? I am so used to crushing my instep to hold my foot, I'm not sure how I'll survive not torturing my feet several days per week.
Interestingly, my feet have "grown"! I had a feeling because my athletic shoes all seem a little shorter, especially on my left foot. Sure enough, I am measuring a 24.5 on the left and still a 23.5 on the right. The fitter asked if I was sure I didn't want to try a 23.5. LOL no, thank you! My left toes are at the end of the boot, but it's still nothing like they were in the 21.5.
Bonus: Black boots match everything.

I'm not a quitter but am learning to accept that I have some limitations and likely will not meet some of the goals I had set for myself in terms of skiing when I first moved to Utah. 
The 115s are too stiff. I'm sure they'd be fine in normal temps and easy conditions, but I have learned that a stiff boot tends to be too much in serious chop and powder. So, I have a 105 women's with BOA on the foot, and a 100 men's with double BOA. The fit is identical. The cuff height is identical. The only difference besides the double BOA is the women's has the adjustable forward lean, but the men's doesn't. Conundrum. The double BOA just has this incredibly even-feeling squeeze and if they both had adjustable forward lean, there would be no question whatsoever. But I'm funny about forward lean. But I also always end up maxing out the cuff buckles even with the catches moved all the way over, then I end up padding around my calf. I don't see that being an issue with the BOA cuff. I'm inclined to go with the double BOA, but will sleep on it. (The other "bonus"of double BOA is it's $140 cheaper.) 
