I personally need a lot of protein and notice when i cut back. Currently around 265-270, and i take in at least 375 g per day of protein, lower carbs right at the moment and fairly high fats. I do not grow much when lower protein intake. I can gain fat if i want, but muscle growth is in need of extra protein. I am a bit larger than most folks, and i am in my 50's and i have noticed my protein requirements have gone up, and my carb requirements have gone down to stay or gain.
I can and do still gain quite a bit when i am in that phase, BUT protein needs to be high.
Never ever have i taken less than 1.5 g per lean lb, not my weight. If i am 15%-20% bf i factor that in, normally i am 15% or less, but i do fluff up once a year or 18 months.
So many thoughts on this, i have tried myself to go lower protein etc, around 25 g per meal, we can digest a lot more than that for protein.
I never found 3 people that all agree on this, but as we all say and know, we are different animals and have different things that make a difference. Protein is the biggest differentiator in my world for muscle quality and overall good health and muscle looks. Carbs come and go, Fats are required always.
Let us know how it goes as you experiment.