I have recently been pushing my bench weight to the point where I'm just barely able to push the bar up on my last rep of the set. I've recently noticed that I've been getting a sharp shoulder pain in the front deltoid when I bring the weight down. I've always been really good with my form by having the right grip, little to know arch in my back, and keeping the bar and path constant with every rep. The pain only starts when I'm doing my last few reps on a heavy set. The pain gets even more exacerbated when I go from bench to dumbbell chest press. Also, I warm up before benching by doing 10 lateral raises with a light weight, a few push ups, and 10 pull ups.
Please let me know what I can do to alleviate the pain.