By this brief description, it sounds like you company is busy, has a strong client base and healthy demand; it sounds like your company is staffed lean and mean; and deadlines are not a critical success factor, i.e., your clients are still providing a healthy demand despite their work being delayed. Perhaps your company is bringing in a healthy profit, as well. If my assumptions are correct, then I would label your scenario as "normal."
Every now and again, you get a product or a company or an individual with such a unique value proposition that customers are willing to stand in a line in the rain to get. Bringing in additional talent can certainly drive revenues up but there is a point where additional talent no longer yields that growth; it is the point of diminishing returns. Perhaps your leadership has determined that is where your talent utilization is and made a decision to maintain current levels of talent and allow deadlines to slide as there is little to no downside to client relations and satisfaction.
I am making huge assumptions here but wanted to bring another point of view or another possibility in the mix of answers.