It is necessary to make that the complexity changed each block. wise people are bored with the capacities of nicehash, because of them the transactions are very slow!
We are releasing an update shortly that will address and correct this. It will be announced in the next couple of days.
It would have been very good if there had been protection from naicehash, because real miners are not interested in digging a coin with such jumps of complexity. We are waiting for a solution.