An oily plane is the norm with glow power so you are most likely safe. Never try to tune it so you do not get oil out of the exhaust. You will be buying a new engine shortly there after. You can lean it a click or two at a time. Unfortunately it is a slow process. Once you get the hang of it and learn the engines you will be able to tune it on the ground. As stated, it is complex to describe it in words and is best done in person. If you needed to tune the "low end" it would have to be done in person as it is far more sensitive.

Do not try to get peak RPM out of it. Just lean it a bit and run the throttle up on it. Repeat the process untill you get a reasonable transition from idle to full throttle. After you get a few engines in your squadron then you can learn to peak an engine.