agree.  I watch difficulty closely.   back mining it now that it's at a reasonable level.   it probably was a nicehash rental that caused the spike earlier.   I hope it doesn't become a common thing like other alt coins (dbix for example).  It ruins the mining for everyone.   they run diff up - collecting the majority of the blocks, drop off (and when they do, block time goes to shit while the difficulty algo adjusts to the network HR), then pop back on when difficulty adjusts back to normal... and repeat.   Then they dump the coins on the market driving prices down.  Nicehash is a bad for miners and for the coins they target..