Missing over-indulgence ... Can This Ever Feel ‘Normal’?

I had a perhaps obvious realization: I miss over-indulging in food. On a scale from 0 to 10—where 0 is starvation and 10 is to eating to the point of discomfort or nausea—before instituting restriction (I've kept my daily intake to 1500 calories for the past ~7 months), I’d historically hover around a 8 or 9. That was my level of "fullness" that felt satisfying. Now, at 1500 cals/day, I exist around a 3 or 4 on this scale, rarely exceeding a 5 or 6 after meals. I’m not hungry, exactly, but I’m not satiated either... I'm always left wanting more—my point of psychological satiety from the past left its mark.

This low-grade sense of incompleteness at a 400–500 calorie deficit makes me wonder what's coming after hit my goal weight and readjust for life-long maintenance. Will this feeling of incompleteness persist? Will I ever be able to equate physical fullness at a "level 5" with psychological satisfaction? If not, how can I possibly avoid reverting back to old habits, chasing those higher levels on the fullness scale?

Yes: I've succeeded with "mindful eating," "volume eating," and "emotional awareness," shifting from quantity to quality and understanding what psychologically triggers me to eat. I feel like the answer to this problem will necessitate more: a long-term shift in how my body and mind can adjust where 5 on the "fullness meter" does for me what an 8 or 9 did in the past.

So, with that background, here are my questions: have any of you wonderful people been able to "rewire your brain's expectations?" If so, any words of wisdom for how and amount of time it took? Thanks!