my tension is anywere between 1.5 and 3.5, depending on the thread I'm using. I also find that I may have to adjust the top tension depending on the thread path, if I'm using the pretensioner or not.
You may want to check your bobbin tension. If the bobbin case was in place when it fell, it may have gotten knocked and bent out of round. I know this is something they warn about with LA machines, If you accidentally drop your bobbin case (or even a bobbin).
Because I use a lot of different weight thread, I adjust my bobbin tension regularly - just like I do with my LA.