All of which goes to show, dietary and exercise advice is as doomed to failure as weather forecasting; just too many variables to make it useful. What works for one person, doesn't for another.
Boab is struggling to get the kilos off, and rather unfairly, I'm not - despite the fact we're doing almost identical exercise (on the same bike when audaxing!) and eating an almost identical diet.
FWIW - I seem to have re-found my "sweet spot", which I knew was there because I found it in 2011 too, though it was harder to maintain then because I was permanently hungry - a failing of the traditional high-carb diet I was on. A mix of intervals, long distance steady cycling, and weights at the gym seems to rev me up nicely, and I eat enough to stave off hunger. Most of the time, that's close to my "target" of 1800 net kcals a day, but one or two days a week, I seem to need more. Monday I was hungry a lot - even on the high fat diet, and managed to put away over 3500kcals (burp).
I'm finding "listening to my body" is working better on this diet. The whole sugar-based hunger rollercoaster is absent. Hunger on a high fat diet is different - the belly growls and you know you need food, but I don't find it a mental imperative in the same way it is when carb-driven.