I feel that the maximum that a weapon makes per m1 should be at most 45, that ensures a long fight but not too much and where all the resources should be taken advantage of more than just spamming m1s and one or the other extender.
Running high m1 build is unfair but also adding a cap just makes having a creative build impossible. Just have to be less aggressive. High dmg but rlly low health so keep that in mind