I don't have any experience with the HE-560, but the HE-400i benefited from the NVX pads. I would recommend posting on Jerg's HE-560 mod thread and anywhere else you think someone who might already own these pads and the HE-560 might speak up.
I got this idea from the HE-6 Thread, btw...
Additionally, I would caution against any of the leather versions of Audeze pads... I don't think you'll get much out of them besides comfort. I have always felt the non-leather LCD pads sounded way better on each of the LCDs!
Finally, I won't know how bright these can get until I can hook them up to my dragonfly. I can report back this evening if I get a free sec.