Built out the way I do it, I can fire those three mjolnirs for a LONG time if my shield isn't hideously pressured. Also since it works well against shields and armor equally, I don't have a care in the world WHAT I'm shooting at because I'm heating it up and tearing it down. If I feel like I need to downflux a bit, I just let off the trigger for a second, pull back a bit, then jump right back in as soon as the enemy thinks he's safe to vent.
It's honestly funny to me how unpopular mjolnir seems to be; it's demanding, sure, but if you can meet that flux and OP demand, it will GET WORK DONE. It might not have the sheer anti-armor punch of a hellbore or the shield popping stab of a gauss cannon but the solid damage, rate of fire and EMP bonus mean it CANNOT be ignored in a fight, especially when I have THREE of them on a ship that can gap close on demand.