With great respect for your DPS and skills --
When there are no melee in the party -- I can do more damage to a single boss with LB than you can, mere machinist though I might be. So please... when the boss gets down to 20%, leave the LB to me. I know when to do it in order to get the boss within the quick-kill margin.
In five of six tome runs through Fractal Continuum, the caster let loose at 20-25%. No disaster, but we wasted time on one more wave of walkin' clocks than we had to.
It occurs to me that machinists are so rare these days that other classes have little familiarity with their capabilities. Too bad.