First get your facts straight. The difference in your example is 50%, not 100%.

(0.00120 - 0.00060)*100/0.00120 = 50 (You probably added an extra zero in the left of 0.00120 by mistake)

Have you ever done mining with hardware ? I think no. That is why you are asking these Qs.

What those mining calculators tell you is simply a theoretical return. In reality mining amount against same hash power varies every day. Even the cost of electricity varies everyday to run the same miner. If you want to make an average, you have to take a data set of at least 3 months. I am mining at cloudmining.website from almost beginning and from my findings I can tell you that the average is fine.

Moreover, as OP is saying time and again, this thread is for giveaway, not service discussion. So, if you want to continue this discussion, you'll better be posting in their service announcement thread as mentioned in the OP or in their forum as OP mentioned in the last post. Otherwise, all our conversation may get deleted again.