Don't expect to have oil residue spewing out of a healthy Saito. As previously posted, some will have a light, clear film and others may have a darker or heavier outflow. Unless it's a visible and continuous flow, you're OK. A 300 RPM drop from max speed setting is just fine and you are describing a very healthy motor. - Feed it some Wildcat 15% fuel or even some Hobbytown USA 2-4 stroke fuel (Wildcat in a house label) and go enjoy it...

quint