Very easy to get solids too tight, especially ones with small lash figures and weaker springs, and ESPECIALLY easy to do while running. I don't like to set them running, and see no reason to. You can get a much better feel when shut off. I used to use tow feelers---one at the specified lash, and another .002-003 thicker. when you can slide the spec blade in, but not the thicker, you are REAL close.

Adjust INTAKE as the EXHAUST of that cylinder IS JUST OPENING

Adust the EXHAUST as the INTAKE is just NEARLY CLOSED