For starters, go over to the powerlifting board and read the bench sticky that Arioch was good enough to put at the top of the board.
Then go to elitefts.com and read every article you can find on bench pressing. I have put well over 100 lbs on my bench in the last year by using the ideas I got from the articles over at elitefts.com
I know some people can get great numbers through old school or bodybuilding type programs, but I could not, and it sounds like you cannot either. Give the conjugate method a try. What is it going to hurt at this point?
B.