You can be crushing the game but when variance hits, and it will, there is nothing you can do to fight against it besides having a sound BR. If you want to continue playing 10NL, just put more money in your account so you have a big enough roll to take the swings that will inevitably come.

You should look at ptbb/100 hands rather than an hour. That stat is only useful after a large sample. You mentioned you have not even played 10k hands yet. 10k is still a very small sample. I would ignore the ptbb/100 stat for now as it signifies absolutely nothing about your game at this moment.