Are you sure the engine is straight? The right thrust angle is usually only 1-2 degrees or so so it might jump right out at you. Typically, a lot of kits have the thrust angle built into the firewall but some don't.

What I would do is fly it as-is and maybe have a really experienced pilot take it up and get his input. If it seems to be in need of right thrust then shim the left side of the mount (left when standing behind the plane) to push the engine slightly to the right. If it flys OK then don't bother, just fly it and have fun.