ORIGINAL: acerc
I would go with the scale incidences so that it will fly tail high which would be appropriate for the aircraft.
To adjust the tail flying position.... both the incidence of the wing and stab have to be adjusted. To adjust only the tail changes the relationship between wing and stab and that can be quite critical and will likely force significant elevator trim, which has a nasty habit of messing up the harmony of power on/off trims.