What "much heavier wing loading"? The Spitfire Mk XVI has slightly higher wing loading. Keep in mind that the Spitfire Mk VIII is a heavier aircraft than the Spitfire Mk XVI due to the retractable tail wheel, extra fuel and, slightly, the full span wings.
OK, use a Spit XVI with full wingspan for an example instead.. If you remove a few feet off of each wing, I suspect the wingloading goes up substantially.
Also the Spit VIII cant be much heavier than the 16, because it outturns it (radius) fairly easily.