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'Discussing with me the books you read' is grammatically the most correct in this sentence and yes the word 'enthusiastic' does exist so the most ideal sentence would be:
You were very enthusiastic when discussing with me the books you read.
(You can even turn 'when' into 'about' if your sentence relates particularly to the person's enthusiasm about the discussion rather than the books.)
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enthuse-enthusiasm-enthusiast 
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