Should I make any changes to my rotation?

[Fantasizer]

I'm currently in 1st place in a rotisserie league with 90.5 points and have a 14-point lead over 2nd place. However, I had 102 points at one point. I'm essentially punting two stats (unintentionally) as I have 4 points combined with ERA (4.06) and WHIP (1.35). My rotisserie points in this lg are R=12 HR=11 RBI=8.5 SB=11.5 AVG=12 W=9.5 SV=10 K=12 ERA=2 WHIP=2

I prefer going after pitchers with solid K/9. My team currently has 260K in 255 IP so I'm not just pitching more innings than anyone else. However, I'm wondering if I should make any adjustments to my rotation. I'm not trying to punt ERA and WHIP... I'd like at least 8-10 points from those stats combined. There are some decent options with young guys (Anthony Bass) and overachieving veterans (Jason Hammel)

I spent very little on my starting rotation (I think $5 to $10) so I'm versatile with it. Just curious as to whether I should stick it out with some of these guys or make some changes. Should I trade one of my relievers for SP help maybe?

LEAGUE SPECIFICATIONS
Yahoo!
Rotisserie 5 x 5 (AVG HR R RBI SB W SV K ERA WHIP); 120 points available
NOT A KEEPER LEAGUE
12 teams, 23 roster spots
1400 IP limit (currently 4.0 IP over)

LINEUP
C: Mike Napoli
1B: Michael Young
2B: Dustin Pedroia
SS: Starlin Castro
3B: Brett Lawrie
OF: Curtis Granderson
OF: Andrew McCutchen
OF: Corey Hart
UT: Austin Jackson (OF)
UT: Bryan LaHair (1B, OF)
BN: J.J. Hardy (SS)
BN: Cody Ross (OF)
DL: Chris Young (OF)

ROTATION
SP Tommy Hanson (recently traded for)
SP Vance Worley
SP Lance Lynn
SP Derek Holland
SP Jeff Samardzija
SP Drew Smyly (Just signed, released Mike Minor)
RP Craig Kimbrel
RP Jose Valverde
RP Sean Marshall
RP David Robertson
RP Chris Sale

FA PITCHERS
Bronson Arroyo
Danny Buffy
Jason Hammel (Don't care for him)
Chris Capauno
Ross Detwiler
Mike Minor (Just released him for Smyly)
Jonathan Niese (Meh...)
Bud Norris (Good K's but weak team and inconsistent pitcher)
Anthony Bass
James McDonald