i don't know what's worng with your arcarum, mine is pretty easy (good luck with your drops)
;_; Shitty mob RNG + the fact my grids aren’t all that strong especially not without taking strong support summons like shiva/europa/etc.
What little drops I get (because I can’t use treasure hunter ;_;) have been OK. I got second tia lance and quiet a few of the cards you need to unlock the summons.