Difficulty doubled in an hour!
price went up fast so the big miners came in for farming most likely - nothing unusual
Where did you see "price went up"? It is not at the bottom but it is far from 3000-2500 where it came for a day after first spike to 5000. Even 1500-1700 which lasted for 2 days is not yet achieved. So - profitability at the moment is far from good. Only if you think the price will go up at least 2-3 times.