Make endgame fights more like campaign

I wish endgame had the same kinds of fights the campaign does, just, yunno... Harder! Small, diverse, threatening groups that encourage the use of various skills. I don't want massive groups of 1-2 enemy types that force you to walk in a circle and sling projectiles, back to back, over and over.

I don't enjoy how rare mods are incorporated, either. So often you get rares like: "create a purple orb that makes the player dodge roll, and a red orb that makes the player dodge roll, and make the enemy periodically explode to force a dodge roll". Can't you make it so certain categories of mods are less likely to be grouped together if they encourage a one-dimensional play style of constant avoidance?

As it is, the most fun I'll have in a map is like... 1/3 the fun I'll have in a good campaign zone.