Oh My Goodness woman, I feel your pain.
Make sure that you are using Organ needles as this is what you are supposed to use according to Janome. Try a larger needle and play with your tension. What might also help is if you lower the extension thingy that your thread comes off of, that way your thread is whipping out from so far up...and as others have said, slow down to the middle bunny, I mean rabbit.