I think you can up protein only to a point, and then there becomes a point of diminishing returns.
Using myself as an example, I've been as high as 500 grams of protein a day in the past and it didn't do anything for me, but 300-400 grams is alright for me as long as my total calories are high too. 1 gram per pound of bodyweight isn't enough for me and I struggle to maintain because my calorie consumption drops as a result also. Like, someone else in the thread said - add extra weight on the bar and really make the effort, as well as increasing total calories in the form of a bit extra protein, complex carbs, and fats and you'll see more gains.