Curse of the hitters' parks teams, OBP too low... I make this mistake all the time, I used to primarily play hitters' parks teams in 200X but this year that is getting too difficult... You must adjust, and be willing to swap out some of that power for some guys who can get on base.
Also, what are you doing with your SP? Using Sampson as a reliever? Generally speaking, it is a very bad idea to use SP in that role as they are marked up when they can start, relievers of the same price usually give you more value. Getting great numbers out of Giese, wow! Pen is cheap but looks solid.