eh don't worry, I've never lost a hime once even to an expert lvl 160+ to 170+, and just earlier I tried a lvl 78 ult and things still went smoothly, (and I consider the lilim right now to be the easiest one I've seen lol) though I know that'll change if we ever hit expert 200+ or ult 100+, but since my union is just casual, I don't think I'll ever see those numbers and its too hard to get experts up to 200+ when you're the only one that wants to do it (seriously, when the experts are at lvl 150+ I'm the only guy that's still doing expert demons while everyone just waits for the day to reset or something)
I haven't really come across any problems (except when some union mates trigger the boss' def buff, which annoys me since it halves my damage output)
and I have like half of my union's PP too lol, I'm also usually the guy that cleans up all the dead rooms in experts and ults