Falling in the standings. Need help! WHIR always!

[samiam88]

I started really hot this year and had a big lead in first place for awhile but now I'm following and am down to third and losing this week so far. I need to upgrade my roster but don't know where to start. Thanks in advance and of course will help anyone out who replies!

10 team H2H with daily rostser changes
Cats: Hitting - R, HR, RBI, SB, K, OBG, SLG
Pitching - W, SV, K, ERA, WHIP, K/BB, QS

My team:
C - Carlos Ruiz
1B - Mark Texeira
2B - Ian Kinsler
SS - Elvis Andrus
3B - Mark Trumbo
OF - Curtis Granderson
OF - Adam Jones
OF - Michael Bourn
DH - Freddie Freeman
BN - Austin Jackson
BN - Bryan Lahair
BN - Alex Avila
DL - Brett Gardner

SP - Zack Greinke
SP - Jordan Zimmerman
RP - Craig Kimbrel
RP - Dale Thayer
P - Aroldis Chapman
P - Carlos Zambrano (stream)
P - Kyle Lohse
P - Doug Fister
BN - Edwin Jackson (stream)
DL - Drew Storen

[HoneyNutIchiros11]

What categories do you find you're weakest in? I'd think your starting pitchers could use a bit of an upgrade, all of your hitters seem pretty solid to me, pitching looks to be your team's weaker area in my opinion