I received back my competition results and both judges described a diacetyl flaw. Admittedly I was concerned about there not being enough yeast when I pitched into primary. I dismissed the potential problem when I had my first taste. Obviously my palate is not sensitive to the butter flavor... Anyway I'm providing it here as a recommendation- if you've got og>.060 then use a starter or 2 packets of safale -05 to avoid off flavors. There's a thread in this forum that discusses diacetyl with similar type beer, OG, and single packet of S-05 if you are interested in other opinions.