I was almost aa successful with almost the very same rebound response. I suspect the draconian measures were about as difficult to maintain for you as they were for me. I can also tell from the way I feel when I let myself slack off and misbehave. I feel like crap.
And people change - What works for a person at one time won't work at another.
I found, after having been strict low-carb for a couple of years that I could introduce occasional high-carb cheat days without problem.
And then after a couple of years I found that I couldn't, anymore.
I've been trying out a number of alternatives, over the last year or so, with varying degrees of success.
My latest variant, started just a couple of weeks ago, looks promising:
But it's only been a couple of weeks, so we'll see.