You could do what Asuna does and shoot every time you peek an angle, regardless of whether or not you think an enemy exists in that general vicinity (I've gotten some stupidly free kills that way)
Me personally, though, I usually go guardian only in DMs and try to just tap as many people as possible before it ends (idc about winning, I just want no sloppy fights if I can avoid them). I have been going Vandal/Phantom + Shorty more recently, though, but that's mainly because I feel like I should be buying Shorty on more rounds than I am but I never find value with it because I don't have the intuition on when to pull it out and when to not