2 added 4 characters in body
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If there’s a difference between the sentences in your edited postquestion, I would say that ‘I was gone’ emphasises the state of having gone and that ‘I had gone' emphasises the act of going.

If there’s a difference between the sentences in your edited post, I would say that ‘I was gone’ emphasises the state of having gone and that ‘I had gone' emphasises the act of going.

If there’s a difference between the sentences in your edited question, I would say that ‘I was gone’ emphasises the state of having gone and that ‘I had gone' emphasises the act of going.

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If there’s a difference between the sentences in your edited post, I would say that ‘I was gone’ emphasises the state of having gone and that ‘I had gone' emphasises the act of going.