Unpredictable behavior

I've been using the Acclimatiser a few times and I have only gotten results rarely. Often it will consume over a stack of items without any results.

Once, when adjusting the heat level of an Austere queen, I went through one-and-a-half stacks of Lava Cans before getting frustrated and breaking the machine, replacing it immediately thereafter. When I put the bee and items back in, the first operation succeeded in turning it from Down 2 to Both 2. However when my Queen's descendants reverted to Down 2, I had no success in changing the Queen whatsoever.

What are the factors for a successful acclimatisation? Neither the Extra Bees wiki nor ftbwiki.org say. Is it random?

Playing Feed the Beast, Mindcrack modpack, Extra Bees 1.5.0.6

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