I hate 20 team leagues, but I'll post my thoughts anyway since you did the same for me.
Punting is dangerous in 5x5, and you punted saves - try at least to grab some of the 'handcuff' releivers with unproven closers if they are available (broxton, wheeler, capps, etc.) and pay attention to the wire.
SP looks great - I like ervin as a 4th starter in a 20 team league. Maddux or dontrell may be trade bait cause you are pretty deep.
Offense is good on power, but could trail in BA and runs with dunn, peralta, edwin all low average, low runs guys. I would trade a starter for a high average top of the order type to play in the OF (markakis, rios, etc). Include dunn if you have to, you have plenty of power. Dunn and Dontrelle could get you a stud OF and then let the domination begin.