tyzippers, I'm sure the OP (and others) would be interested in your opinion, as a secondary racker, to know when (if one chooses to at all) one racks and how does one know when to rack.
Always wait till after or at least till the very end of primary fermentation when there is only slight activity in the airlock or when the FG stops changing.
I wouldn't go by activity in the airlock to gauge if fermentation is done. Like you said, wait until you have constant terminal gravity over a 3 day period....but don't trust the airlock.
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