First of all, you cant go by the manual, it all depends on where you run the car. Altitude, humidity, air density, and weather all play a role on how you tune the engine. Second, I would say that Piccos tend to loosen up at about 15-20 tanks, and when they loosen up you need to retune. Third, idle that takes too long to come down means that your LSN is too lean, so yeah, go rich, and see how the engine runs. The idle needs to come down pretty quick after you rev it all the way up. Just richen the LSN and tune from there.
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