My current class I'm using atm is pretty good, I've been loving it.
K7 w/ Extended Mags and Grip
Thermobaric Nade
Ready Up
Marathon
Agility
On the Go
Dead Silence
Blast Shield
EDIT: SMGs are great for the maps you mention. You'll often be close enough for SMGs to be within their strongest range, and mobility is a great thing to have on your side in HC Dom. Quickdraw is not needed on SMGs IMO because they ADS quickly anyway, and they have great hipfire ability. Ready Up really makes them shine for RnG in HC