To add to Ezodagrom's list, 'First hit on enemies' is also a contributing factor to the individual score. But indeed it needs to be emphasized that 'individual' scores are meaningless. It would have been better if it never existed. A lot of players sadly get distracted by it, to the point of losing sight of what really matters.
I used to be one of those in my early days. When I was younger, I only sought glory to stroke my own ego. Too focused on "what's best for me" instead of "what's best for the MPA". But as time moves on, one comes to understand that in the end it doesn't matter. Getting '1st place' won't get you rewarded with anything special nor will your name go down in history for it.
True greatness on the battlefield is to be achieved by anticipating and adjusting one self to the MPA and towards the course of the battle. (What does the MPA need of me? Not the other way around.) If you see the other 11 players 'heedlessly' converting towards one point of the map, due the majority of the people having their mind set on; "Where the action is, is where I need to be". Make sure that you are the one covering the other part of the map, even if it seems nonsensical. It will adorn you, cause there will come a point in time that the rest of the MPA will arrive too late to the other side of the map once enemies start spawning over there. But you anticipating it, will be there to hold the line until reinforcements come. (Or you kill all enemies before that happens.) Mining Base UQ's is all about 'coverage' & 'communication'.
Remember this great quote as you play any of the Mining Base UQ's;
"Water covers two-thirds of the Earth. I cover the rest."
The advice mentioned above doesn't really apply to the first Mining Base UQ, as it barely needs strategy nor tactics to get a perfect run on it. But from the second version and onward, it could be 'the' deciding factor in saving those towers. And or getting a S-Rank.