93 Cutlass Suprm Brakes!!!!

I have a 1993 Oldsmobile Cutlass Supreme SL, 3.1 L V, and ever since i got it the brakes never felt good, i recently changed front calipers and rotors, and bled the brakes, all should be good, but when i drive, they arent as strong as they should be, and today i tested them in the driveway, under the engines idling it went forward, and i slamed on the brakes, the car stopped, but it was like a quick yet gradual stop, and i dont have anti-lock brakes, could there still be air somewhere, or is my power booster bad or something, any information on how to find out whats wrong, or if this is normal would be great.

P.S. Sorry for the long post, but brakes are a big issue, and they have to work.