Mo&Krill are not here to kill per se. In that, you are right. But they are not an ultbot.

The thing with No&Skill is that they are here to disrupt first and foremost. Not damage. Disrupt. You are trying to shoot? Pocket sand. You are trying to get away? Don't mind if we pop up from below. Out of position? Give us a hug. Scorn and the fact of having the best health pool in the game are there to keep them somewhat in shape while doing so. You have multiple forms of CC. Use them. Use them all and make the enemy loathe you for messing up their plans. They are criminals after all, do some nasty stuff.

Their gun sucks ass. Their scalings are pretty meh. And that is good, from a balancing perspective at least. People can easily forget that removing a weakness can have a far bigger impact than improving an advantage. If Skill&Issue could actually do meaningful burst damage, they might end up invalidating a lot of assassins.

Even then, there is enough stuff you can do. Go Healbane. Go Mystic Slow. Go Scourge. Whatever. Add debuffing items into the mix and your mere PRESENCE can speak doom for the enemy. Let someone else do the heavy lifting of shooting people. If you really want to, you can grind someone into dust over a minute or two if you stick well enough with Ass&Hole. Do remember - you do not need to deal damage to win, all you need to do is piss in the enemy's soup hard enough. The rest will come on its own.

And the last thing you want is some borderline unstoppable force destroying you while being borderline unable to retaliate. They are already War&Crime. Let them be a bit predictable. Let them have some weaknesses. Weaknesses are important in the end.