You only have to smog that thing every 2 years so don't sweat it until it needs another smog test. The test only stations do not give a great test, they only test until it passes and then goes on to the next test. You will always see one area that barely passes on these cars. If you reduce the HC (hydro carbons) you will likely drive up the NOX and then that will be the item that just barely passes.

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Doug
'83 300SD "Old Gold" 170,000 mi.
'82 380SL "Green Machine" 190,000 mi.

Some days you're the pigeon, some days you're the statue... I'd rather be the pigeon!