I wished to help ... = I had the thought, at that time in the past, that I was going to help you, because I wanted to help you. ) I wished to have helped ...
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CalifJimI wished to help ...
= I had the thought, at that time in the past, that I was going to help you, because I wanted to help you. (No expectation about when the help would be finished.)
I wished to have helped ...
= I had the thought that, by that time in the past, I would already have helped you, because I wanted to (and expected to) have already