Proper lifting form trumps everything else. If your form collapses, it doesn't matter that you're slinging twice your body weight.

If the intended muscle fibers aren't recruited correctly, other muscle groups may dominate the exercise, which adds unnecessary stress to muscle groups that aren't designed to bear heavy loads. That's how you get hurt. No one builds a strong chest while sitting in physical therapy or dealing with an injured back or shoulder. Throwing up big bench numbers may impress the bros at your gym, but it's not a good long-term strategy if those numbers come at the expense of good form.

Executing proper form, performing reps at a slower tempo, and focusing on using your chest throughout the movement will maximize the intensity and effectiveness of the workout, while minimizing injury risk.