^^^ it was a little difficult to read your post. but the copper spray is not the culprit here.

to the op, the only thing that kind of scares me is the 10psi difference on cylinder number 1. i know everyone is goind to be like oh its ONLY 10 psi difference, but it really is more because that cylinder has oil in it so that is going to elevate the number on that cylinder. YOU NEED A LEAK DOWN TEST PERFORMED. it is not expensive to have done.