Hi!
Well like you see with the Fuji the things ain't like that. It always pulls the plane a bit even at the lowest idle position. So this is why I think I have to reduce the low rpm's a bit.
Best regards!
P.S I didn't understand the last thing you have written

. I am from Bulgaria and our electricity characteristics are: 220V @ 60 Hz. How 3000 rpm are related to the frequency?