The boss + horde thing is intentional design. Every boss comes with a horde now. I think it’s dumb but meh.
My director, like some peoples’, is just bugged in general, like deed contamination was in 1.0.5 but much worse, and all the time. As per this post, spawn rates across the board increased 2-3 fold for some people from 1.0.5 to 1.0.6. Thousands of kills per level and over a hundred specials.