Try to bend the bar up. This creates external rotation (outward rotation) at the hands, this tension travels to the elbows, it helps to stabilize them better which makes the movement safer on the shoulders and allows more force to be transferred.
Stop benching with limp legs. You want to bring your FEET as far back as possible while keeping full contact on the floor. Open your hips up by driving the knees outward to engage the glutes and hamstrings. Doing this allows you to tense up your legs and drive some force through them while pressing.