On the profile plane, just don't worry about it. The thrust angle (centerline of the crankshaft) is still parallel to the centerline of the fuselage plank and the offset isn't enough to be concerned about. If it WAS an issue, it would have been addressed in the instructions. If you decide you want right thrust, add washers under the front eng mtg lugs. I'm assuming the eng is mounted on its side) exhaust facing down.