Mikey, I've been dealing with this for 4+years now. Baby steps compared to some folks. I remember D3 telling me what that counselor told her and she now told you. I listened, but didn't quite assimilate all the information. As I look back, I now know, that counselor was right. Our difficult child's eventually change and move on (that onward is not necessarily a good onward) and morph into different beings. They are not the same and they will never be the same.
I am surprised that you still seek to find difficult child by car however. One of the things that many counselors will say is to sit back and let difficult child experience the consequences of his behaviors and to not get sucked into the drama. Although it is difficult, drawing a line in the sand makes not getting sucked in easier. In your case, maybe you and wife can just hold on until difficult child is 18, graduated and then let him move on to whatever he desires. You might just give him the basics with no emotion and let him earn his way back to the family.
There is no "right" answer...just what works at that present time.
Take your wife out, that means alot.