Anyone know the rates at wich you get some bosses such as Ayuni, Leeuni and Eruni? I ended up only getting 1 Nomad in 500 kills and was wondering if I can expect another 500 kills before I face these 3?

How many floors do you do in a row? I believe they only show up after a certain amount in a row.

I thought that may be the case. I do endurance till I die, if im lucky with bosses I tend to get to f20 on average before I luck-out and get pest queen. (i dont try with her anymore)

It's just luck really, you should be fine if doing 20 bosses in a row. Just make sure you don't run out of food/supplies when you actually do encounter the do no evil bosses.

If you're just "farming" bosses for kill count, it's best to wear your best offensive melee gear and d claws and reset the waves everytime you get a boss that takes a decent amount of time to complete. Let me know if you need a list of bosses to skip.

 

As for the Apes, they don't appear until wave 6. With the exception of Nomad, I got at least 3 of each of the highest-class bosses on wave 6 by the time I got to 500 kills... and the majority of the time I would reset before making it to wave 6.