As promised.
I use two Dom loadouts, one for during the day, one for night:
And these are my gunz:
Note: these are my GCZ builds. I have other suits/builds for different scenarios in combat - as welk as further stuffs and weapons for other er... stuff.
I did only 1 massacre mission and I used the Dom day build above. It wasn't that difficult. Once you've done a few high CZ's, ground combat feels quite natural. Mind you, any lack of concentration will be your undoing. Especially if a sharpshooter and enforcer hit you at the same time - and they seem to have knack for it.