In order for God to be perfect, His words must be pure, holy and perfect.
By what you are saying, we don't have the words of Jesus. How do you know Jesus' words are perfect? How do you know they can be trusted? In your mind, we don't have them. In your mind, what we have cannot be trusted since they are merely a translation of what was given 2000+ years ago.
We have everything we need to have. We do not need all His words He ever said. Even synoptic gospels change His words very obviously, but leaving the meaning to us.
If 4 gospel authors in the first century were uncertain what His words exactly were, I am not sure why do you need them in "perfect" form today.