It'll also cliamb if the airlerons are set too high.
If you had thicker foam on the wing's saddle it'll change the wing's angle of course.

Since it's an ARF , I'd follow the instructions but you never kown.
I've glue the rear center section pieces upside down before, if you align the airleron to it , it's going to be off.
I notice it after using the airleron guage, of course


For the cowling.. I used left over berch spar pieces..It didn't look bad plus it gave a path for air to exit the cowling