Quick update. After about 13 hours of use with treated fuel it is noticeably less smoky and stinky. Good improvement so far.Excellent! Get a few extra filters, you`ll likely need them.
Be sure to give it some time to clean everything out after adding the additives. Hopefully this will help your problem. Could be some junk built up and just needs a GOOD cleaning out. Likely need to keep treating it thru winter with the cleaner... i would if it were my situation. Years of build up does not disappear just in a couple tank refills.
Let us know how it works out.