Dave, in all fairness you have a problem you've never been able to solve. My 22RE has the performance head, cam, etc and idles like butter and runs like a top. However I do agree they are still not hot rods on the street.
My suggestion was more along the lines of basic maintenance like getting the valves, valve seats, valve guides checked/rebuilt and a new timing chain.
Randy Rosetta KDØKWX TLCA #19351 2015 Rubicon Hard Rock & (2) 1970 Boss 302 Mustang's