Im seing some really huge spikes in the stratum difficulty. Its currently on 600k, last one before was 1m, one before that was 220k. Is this behaviour normal, cant remember to see such huge spikes in stratum difficulties while mining other coins.
The pool went form 20KH to 150KH in a few hours, all this causes the network to start adjusting itself. Also the pool gives work varied on what it need to solve the algorithm. After a few days at 150KH it should be more stable. Unless it spikes in amount of miners and the network will work itself out again.