MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Width 0.53 is for the fuselage, but only if otherwise would cause infill between inner and outer perimeter (line).
The wing is supposed to print with width 0.5 or even less to prevent travel moves.
What is the weight of your wing?
Have you also checked whether the thin wall is actually printed as thin as you have set it?