For fatties, I use a technique that Te No Kage referred to as uki waza..... I don't know about that name whatever.
Suffice it to say I do not hip throw fatties. At 165lbs I tried a hip throw on a 345lbs who is the same height as myself, that stuff does not fly.
I have had far greater success against big boys with shots or better yet trips and sweeps where you pull the opponent into or over yourself. We used to ahve video up of me taking down the aforementioned monster with "uki waza"; a purdy sacrifice throw that brought me straight to mount. While Dio is no fatty, you can see me do the same technique to him- though less dramatically- at roughly 2:25 of this video. I use that kind of take down a lot.