You have to think about your original wager amount, at 2k. Would this hurt you or your bank roll to lose? If so then yes middle it. If not, then I say let it ride. That is a great number to have and don't like the under at all in this game so it scares me from the middle and you just pushing. The way I look at it is you then have 4k on the table to return 4k, that's losing my money in my book because you're not making any money on it. I don't like risking my money to push. I'd like my odds safely to cover the over to make 2k much better than hitting the middle to make 4k.
typing from a phone so hope the jumbled down version makes any sense. But it is gambling and if you like it hit it. Or if you really want to play the middle, maybe hit the under with 1k. That way if it goes Over both you still make money, middles you hit nice, and goes under you don't lose the full teaser amount.
Good luck buddy