Lets get back to your present situation.
Do a compression test and a fuel pressure test first, lets see what we're working with.
When you do the compression test, do the first test dry, then do it again wet (a small squirt of oil in the cylinder), doing it this way will tell us if there is any lose past the rings.

After the compression test, adjust the valves with the method I posted above, then test compression again to see if it increased any.

Let us know what you find.