How long did it take for you to lose the 100 lbs?
I don't think you have to worry at all about muscle loss, as long as you continue to train hard.
However, I didn't realize about your history. And that's the only thing that concerns me. I wouldn't want to see you have lost the fat too fast only to gain a good amount back. A lot of that is mental.
And that's why I highly recommend periods of maintenance after periods of success. But I also think getting over the mental hurdles of eating less and being flexible and not being afraid of food helps a lot too. Why? It's partially related to the idea of going 80/20.
The idea is for you to know every method for calorie reduction at all times, and use it as a tool. That way you can be as flexible as you want and not have to be afraid of food anymore. If I want to go out on a hot date and eat what I want, I'll skip all meals that day prior to dinner. The same goes for holidays. If I have any days where I eat more, I can always make up for it by fasting or inserting days where I eat less calories.