I think everyone has given you great advice thus far and I like the fact that you are correcting with a no-no and then sitting down with your baby and showing him soft touches, etc. If you can incorporate some kind of treat - even putting a small bit of peanut butter on your son's finger and letting Kopper lick it off, I think may help. Kopper will view you son as a place to get good things. Just a thought. And I am glad to see that you are not giving up on him. I was following your threads before you brought Kopper home, so I know that you were asking questions then and educating yourself about your newest bundle of joy.
