You do have a point with the more bandwidth usage. It won't necesserially be 40x more but it will be a larger value from where more data is having to be used from where the machines can hash faster. (Please correct me if I am wrong but I am pretty convinced that it WILL use more. Not 40x but a higher amount)
That's what I was thinking but really had no idea...
use forum search
use
"stratum"
and
"GBT"
as search terms
sorry I don't have time to get links
this has been anticipated and worked on for some time and is well covered
I've heard of stratum but haven't read much about it, so thanks I'll do that.