I do not think the 400% stacks with other stuff such as bracers and parties.
I have not managed over 650% exp. (although with an exp event ad maxed fortune 840%is possible)
But for to curious here is a breakdown of exp additions.
Party-150%
Bracer- 200%
Seal- 200%
Potion-100%
Event- 100%
Fortune- 90% (3x exp8's)
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