Try switching to DB's for a while, or do like incline one week, flat the next, incline, etc...also I would recommend the following rep schemes for strength:
5x5---KING
4x6-Solid for both strength and mass
8x3
6x4
10x1
8x1
3x3
***Note, the closer you get to heavy singles, the more you want your CNS to be in shape, so don't go from 3x8 to 10x1 all of a sudden, go to 4x6-5x5-3x3-10x1...this way your CNS will be able to handle the heavier loads...
Petey P