My first thought was maybe you ought to check out getting a bench shirt.....
Joking aside, maybe he meant 80lbs on each side huh? Ok probably not. I still dont know where you're getting those numbers from.
BP is a fully upper body gauge of strength. Its the whole system from pecs to triceps to shoulder development. If you're just trying to work on getting your bench press up without these others, you'll go...up...but not far. Eventually you'll get slowed to a stand still without working these other muscle groups.
First thing I would check is your form. I dont recall where, but you can search and find out plenty of articles on here about proper form.
Still...you need to give us more info to help you out like actual weight, if you're using a straight bar or whatnot (I prefer dumbbells myself), age, sex, etc.