Many models, especially trainer types, have the firewall installed at a slight angle to provide right thrust when the engine is "straight" in the mount. I think the Superstar is like that.

If you are new to RC, I do not think you should do a lot of guessing or adjusting based on RCU posts. I would ask an experienced pilot to look the plane over and recommend any changes. He could possibly do the maiden flight.

The MAAC has a club listing so it might be easier than you think to find local help. http://www.maac.ca