Wouldn't it be better to make the bridge to the natural wider and have it face the other way, so close-by-air mains are not also close-by-ground mains?

The distance isn't that bad. I suppose the left/right side mains could have their bridges going the other way but in the complexes between the mains are heroes to mind control. It'd put them at a further distance from those mains which I'd rather not do just to gain a little more nat2nat. I think the bridge widths are pretty okay.