Shade
Monster Junkie
Yes, some variant on Fling seems the best way to go. Although, being a supernatural gravity-manipulation effect it presumably isn't limited by weight (or, rather, mass). Might only affect objects up to a certain volume, though. Perhaps a 10 foot or 15 foot cube? (e.g. Huge creatures or less).
Well, Su doesn't necessarily rule out a weight limit (see telekinetic effects), but I'm not sure we need one.