This is a screenshot from 18th Aug, I was on my second class so I would have the +50% bonus.
I didn't have rested, nor food, and I can't for the love of God account for the remaining 150% bonus.
The fight is at one of the altars in Tam-Tara. No chain bonus, and killing the imps before the boss showed up, each imp gave 621 (+200%) experience.
@Skies: No it's not chain bonus, chain bonus would have showed up like this:
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