Well, that’s the thing, I am not seeing much growth of the vertical margins. At max width they’re still not as wide as the horizontal margins between sidebars and main section. But my screen size might just not be large enough, I suppose.
Sorry to drop in here so infrequently, I’ve only had time to work on the site very intermittently. The zoom didn’t show any issues either. I am not quite sure what you mean regarding the settings in the developer console, however. I am at a bit of a loss how to do this testing, I admit.