drop cassell and schaub. try to trade one of your DEF, you really only need one. Trade the one that will get you the best value.
you have the right guys starting, they just havn't scored a lot. If Grant doesn't pick it up, consider starting McFadden over him especially if McFadden has a good matchup, other than that hold out and get Bryant WR or Slaton RB off waiver wire for those QBs.