Well gee, you fix the big issues before worrying about the little ones. You wasted a whole fucking decade...and your plan is to eat in a restrictive way to gain muscle at almost 30?
Good luck with that.
You would think the major issue is making sure you are first eating enough calories to gain anything at all.
Your exact protein intake is secondary to this.
It is also less important if eating enough carbs and fat and overall calories.