Congrats on your loss! I used the aforementioned Hacker's Diet (CI/CO with some habit-forming structure) a decade ago to get my BMI from ~33 to ~23 (at which point people started telling me I looked sick, so I backed off).
CI/CO definitely works, but both sides of the equation need to track a feedback loop in order to function correctly. On the one hand, your body will reduce its base metabolic rate as you start depriving it of nutrition; on the other, the nutrition labels on food aren't necessarily representative of what your body can get out of them.
The other issue is that often the foods people with weight issues eat aren't the same foods that are conducive to weight loss... it's psychologically very difficult to maintain a calorie deficit when many of those calories are taken up by sugar water, for example, where it's much easier when the calories come from nutritionally complete, fresh foods.
As usual, proactive lifestyle change is rarely about the facts of what should be done (literally everyone knows they should be eating vegetables and exercising) as much as the psychology (it's difficult to consistently make decisions that add stress to your life).
