Wait 1,000 days.
Why would May raise respect? Why is it even needed?
It is worth fighting with one set. Optimally with a pack of cartridges perk. Then you don't have to watch the cartridges.
Example batch:
Milou Skye
Connor Sunderland
Einar Corso
Felix
Samuel Spartan
Or "sharpshooter." But you have to watch the cartridges.
Cassius Bauer with a minigan is good