DP Ultimate engine....
I have a friend that has this combo. His has a YS 120FZ on it with a smoke system. I have flown the plane and it flies great! It has plenty of power it will go vertical forever. I haven't tried to hover it but I am sure it will do it.
We fly at 6200 feet elevation so if your elevation is lower you will even have more power. He uses Powermaster YS 20/20 fuel.
You could go with a different engine for more power but I don't think you will need any more power unless you are really into 3D flying.
Try your YS120 you will love it!!