I don't know of any specific jello removing props, but I have picked up a thing or two about jello in general...
1. Fasten your camera mount to the Phantom using Velcro... only Velcro.. no screws... This will take almost all of the jello, unless your phantom is shaking like crazy.
2. Whichever props you use, balance them. This will help allot also.
3. Using GoPro? Shoot in 60 fps....
4. Want to go all out? Get a ND or polarization filter and find a way to mount it in your gopro. It will force the shutter of your gopro to operate a bit slower, thus removing shakiness and jello. Its not really "removing it" tho, it is simply making those areas a bit more blurry. Video will still look great. I'd rather have a bit of blur, then a whole lot of shaking and jello.
Sincerely, Alveprinsen.