Ugh, I'm sorry for the length of this reply, but you triggered something for me. And anyone who has read any of my postings here knows brevity is NOT in my toolkit. On the other hand, no one has to read it.
I can't really offer better suggestions than others about what to do or read or eat, and you're already doing the right things by reading the books mentioned, etc.
But I read your question as "how to get out of a certain mindset," and I'm more interested in that than your macro-nutrient ratios or your bodyfat. It's not about fat, carbs, pounds, and eating--not really, is it? I think it's more about your expectations and hopes and fears.
And it's about your (our) culture.
I don't know exactly how you can convince yourself to not feel bad about eating more fat, nor about being more fat. Most of us here would agree that our current twisted food culture has deranged us, and I don't care how easy some people in Paleoland act like it is: it's really hard to resist one's culture. Food culture itself, discretely, is especially difficult to resist because of the myriad ways it's woven into all of our traditions and our survival. Our food culture is part of our essential identity as human beings, and each human culture has unique food culture.
Your feelings about fat come from your culture. Sociologists call violating cultural norms "deviancy," which sounds like a dirty word, but it's really not. We're all conditioned to avoid deviancy because deviancy is typically punished. It's positively ironic that eating more fat is deviant behavior in a culture where simply eating MORE and MORE of EVERYTHING (more fat, more sugar, more corn syrup, more refined horror-show) is perfectly normal. And obesity is also becoming perfectly normal.
But normal is just a description of what is, not what should be, or can be, or ought to be. And you want to do something that's not normal, so you're feeling like a deviant. No wonder you feel weird about eating more fat. Feeling weird about it is totally normal!
And it seems like being normal isn't serving you well, and you don't like it. The type of deviancy you are contemplating isn't criminal, it doesn't hurt anyone else, and it's perfectly consensual. It seems like a little thoughtful, deliberate deviancy is in order here.
It seems like you are relatively young (child-bearing age, anyhow), so barring tragedy, odds are good that you have a lot of time on your side to experiment and see what works for you. So if you look at it that way, why not just try something different from normal for awhile and see what happens?
If you imagine you might live to be 80 or 90 years old--maybe older than that--then what happens in the next 6 months might not seem quite so terrifying. You're in this for the long haul. You're going to want to see what it's like to be grandma. This is a marathon, not a sprint. Can I run a marathon today? No. In six months? Probably. Between now and the marathon is training and conditioning, experimentation and experience. You have time. Take your time.
What is the worst case scenario? You eat gobs of fat, gain a few pounds and find out that more fat isn't the magic bullet for you and something more might be required? Is that scenario truly unbearable to a person who, after all, has endured pregnancy and given birth (twice!) and lost 45 lbs each time? I'm guessing you'll survive any small setback just fine. (45 lbs in six months is an excellent rate of weight loss, by the way--obviously your body knows how to lose weight.)
Or....perhaps you'll start losing. Maybe you'll start losing very, very slowly. Maybe it will melt away like grass-fed butter on a hot cast iron skillet. Maybe you will experience other benefits that will start to make the weight loss seem less important, and then suddenly when you're focusing on other things, you lose weight anyway. So many possible variables, therefore so many possible outcomes. This is going to take some experimenting--and some time. Which you have plenty of.
I guess I'd just suggest a little psychological triage here, try to remind myself of the level of urgency of things. A pound--or even ten--gained is not an emergency. Not losing weight (at least at your level) is not an emergency. The definition of "not an emergency" is that you have time to deal with it, so don't freak out right now. You have time to make course corrections along the way.
So, if it's not an emergency, and you're not freaking out, and there's really no one else besides yourself to punish you for deviating from the norm, then in the interim, why not try something new and see what happens?