AL only - roster decision help in push for 1st

[SlideRule]

I've roared back up into the running in my 10-team AL only and currently sit in 3rd place, 2-4 pts behind first depending on the day. I made a handful of upgrade (ie dump for the other guy) trades in the past few weeks, but I need some help in deciding how to structure my roster. The best place for me to gain points is in the pitching categories. I am:
- very tight in ERA and WHIP, could gain a few points with a 0.03 WHIP improvement
- 2nd to last in W at 52, but there are 3 other teams with 57 wins. Beyond that I won't catch up
- 40 Ks behind the next guy, and about 100 behind the one above him.
- tied for 2nd in saves (will pass this guy to get sole 2nd place) and then 13 saves behind 1st (who has Betances/Robertson). (I have Kimbrell, Chapman, Diaz, Dyson)

My question is, do I try to gain points going after Saves/WHIP/ERA by keeping my 4 closers in, or do I try to go more with starters and catch up in Wins/Ks and hope that doesn't hurt me more in WHIP/ERA? I guess this boils down to, do I start Smyly over Dyson, and maybe later do I start one of the other crappy starters over a closer if I can't gain more points in saves?

My pitching staff is currently:

Starters:
Felix
Sale
Rodon
Pomeranz
Duffy

Closers:
Kimbrell
Chapman
Diaz
Dyson

Bench:
Smyly
Shields
Andriese
Gibson

Thanks!

[virgonomic]

With that bench, I would leave Dyson (and the other 3) in there, as he does less damage to your ratios.