Try my SMG loadout.
MSMC
-Suppressor
-Fast Mags
Lightweight
Scavenger and Toughness
Dexterity and Tac Mask
Perk 2 Greed
Perk 3 Greed
I use this setup in TDM which is the game mode I play 99.9% of the time.
You can also try the same setup with a Peacekeeper and you'll have increased range due to the lower recoil.
Let me know if it worked for your style of play. I have 2.39 KD with the MSMC and 2.4 with the Peacekeeper using the setup above. My overall KD is at 2.72 with 341 SPM. Those are my two go-to run and gun SMG setups.