i been lifting for a good 6 months concentrating on compound movements such as bench press, squats, deadlifts, rows, etc. i always lacked on the bench press and would like to push more weight. i started looking into using different style form to achieve this. i have always used the traditional form; butt stays on bench, feet on floor, back flat, sticking chest up during the lift. eariler tonight, i decided to try new things by throwing my hips in the air, legs more in, standing on toes, and positioning the bar so it hits my lower chest level. i wasnt too sure if i had my form correct so im seeking advice.
on the other hand, whenever i go heavy with this form, my whole body would shake/vibrate on the last few reps. calves and arms would shake like im about to collapse