Diggy, you have shown the issue with using a larger camera and lots of wet glass.
Here is an eye on a squat anemone shrimp...roughly the same size as the eyes in your first image. and a bit smaller than the eyes in your last image. As I only post in facebook these days, will have to show that image, which is seriously compressed.
I cropped the image (so one could see the detail.
This is not because I'm some super photographer, rather it is just the technology. If you want really sharp super macro images, you need to use as close to F8 as you can (high means less resolution) and you need the least amount of total glass.
I shoot lots and lots of medium to poor resolution...and that is where I would put yours. But every so often I get everything right. As you never see that level, I understand your view.