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Usually it does bother me that both first and middle are the same amount of syllables, but because Tabitha and Imogen sound so different I think that they work. The seriousness and beauty of Imogen also offsets the immature, cute vibe of Tabitha too, which I like.
Tabitha Imogen is by far my favourite out of the ones you've suggested. I like Tabitha Isis but I guess it wouldn't work with your last name. So, Tabitha Imogen it is :)

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