Is there any way to "force" The Hive bosses to spawn?

Question

I don't know anything about bosses from The Hive undergrounds. I've already killed around 5000 Hive Overseers and haven't noticed anything about their respawn... Does anyone have a clue about it? xD

Comments

What bosses do you mean? The Bane bosses at the main Hive construction or the Nemesis bosses at the Hive Outpost?

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The main Hive construction, at Gray Island

Answer 1

When I was charming Hive Overseers this is what I did and it works 80% of times. 

• Do your normal hunt at Hive Underground for 25-30mins. 
• Get out of the resp (Go to the city) for 5 mins. 
• Return to the resp and check all bosses.
• Repeat, repeat repeat.

With luck, everytime you return you will find 2 bosses.

I've never found more than 2 bosses alive, i think that's impossible. 

Comments

I used to hunt there for hours and now your making me realize if you leave and come back (the map respawn maybe?) usually a boss would spawn. I would find more than 2 bosses spawned at once at times when I would check without hunting but not using your trick I think. (it's been years though)

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I'm not sure about the reason, maybe boss respawn is a blockable spawn.  
Of course forgot to mention that my "trick" is quite recent, we used it to fill our bosstiary.