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Now that I've thought about it for a bit, I'm wondering if it has anything to do with the movement from Sheffield "Hollow Ground" blade (which were typically half or quarter hollow), to "modern"...

I'm pretty sure an extra hollow is even more hollow than a full hollow. I'm pretty sure the blade becomes thinner closer to the spine.

Most of the difference in feel that I've noticed is in heft and flex. Hollow blades tend to flex more and have a lighter feel in the hand. They are also more likely to nick you if you are not...