yes, mine have gotten very top-heavy. I've staked them in a spoke design - one thick pole in the middle of the pot about an inch from the main stalk, with individual branches tied to the pole on an as-needed basis, kind of like spokes. I will try to take a picture later of it.
One thing I've noticed about the Jimmys is that although they have thin stalks and heavy fruits, the branches lean and ALMOST look like they're gonna snap off, but never do. They bend a lot, though LOL I haven't actually seen any branches break off from the weight, although by using spokes, I'm not taking any chances. Will try to post pic later.