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The calculator:
http://whattomine.com/asicor
http://www.coinwarz.com/cryptocurrency...
[/quote]OK what you have to keep in mid is that those calculators do not take certain things into account, most specifically diff increase (i.e., 13M going up to 18M) and increases in the network hashrate. They are just designed to give you a ballpark. When you combine that with the insane orphan rate, lately, you get the "loss" you're seeing.
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The difficulty is very similar (dynamic but within a 7%+/-) on both the calculators (13.2 mil on whattomine and 13.5 mil on coinwarz) and the pools figure (13.5 mil) on Network difficulty. My experience with these calculators over the past 8 months has proven these tools are rather reliable. There's too great a variance at 75%.
The orphan blocks is something I wasn't aware of but in doing more research on it, it appears that eMark experience 22-35% orphaned blocks. That's an opportunity loss on 22-35% of blocks. Still doesn't make a 75% difference. But pool efficiency is one question that I was posing as that is a mitigating factor as well.
I'm sure this sounds argumentative and it's not intended to be. Trying to understand the variance.