Scaling for multiplayer is too high

I get that being two, scaling up enemies makes sense. Otherwise: where would be the challenge? But as it stands right now, it feels like we are being punished for playing coop.

Attemppts on bosses are significantly higher in coop (sometimes 10 - 20 times depending on the boss). Even I struggle in mp, while I can do the Bosses in 1-3 (or few more) attempts, when I am playing alone. It is ridiculous. (Final Boss in Act 2: not able to bring down in mp yet. sp: 1 attempt, with a witch dare I say, that is built towards crowd with chaos and curses and not so much against single targets).

It is kind of sad, because it feels like PoE2 is a nice fit for coop-play unlike PoE1. A friend, whom I bought the key, is so frustrated at this point, that it will be hard to keep him in the game, because he is stuck even after fixing his built as much as I can.

I don't want the game to be easy, but the difference from sp to mp is way to high imo. Bosses should be doable in the same time as in sp, which still means that one would be only half as strong as in sp and teamplay would be a necessity.