Just use 1 full damage config and diamond formation.
1: Activate shield repair when you have lost 50k shields.
2: Activate hp repair when you have less than 100k hp left.
3: Activate hp repair beacon when you have less than 100k hp left after using first repair ability.
4: Never use repair abilities if you have shields up.
5: Never use shield ability and repair ability at the same.
2 & 3 because if you activate repair beacon when you have for example 90% hp left, it will only heal you full 20k for 2 seconds, after that you will only be getting max 10k back because you use diamond. If you wait for your HP to go down and activate when you have 100k, you will have full HP when ability runs out. -> you activated repair ability 10seconds later -> shield ability has cooled down -> you get the idea.
You should be able to do this without sab if you have atleast 25% shield booster. With double boosters it's too easy
You are only wasting time if you use big shields, you will use same amount of ammo but spend more time.