Just as Llama previously stated, Tower of Fate 2 is a nightmare, but I found it rather entertaining because of it being an actual challenge. Hell though, the final boss only took me about 2 tries because of cheap pit deaths - compared to the 10 or so deaths in the boss rush. What I did was attempt the bosses first without using the chalices, right up until I got good enough to manage them efficiently, and been fortunate enough that the RNG decided to throw the toughest knights first!
For reference, King and Tinker Knight were last (in that order), and the latter got hit by the platter bomb!