I have been getting a sharp pain in my shoulder when I use the flat bench and incline with the bar, This does not bother me when using dumbells. It seems when I get to my max using the bar that is when it happens up into that point it feels ok.... I feel the pain in my rotator cuff area. It puzzles me that I hardly feel anything using dumbells... any suggestions.... I have been trying to do more rotator cuff excerises...