I got a few ectos from graspings awhile ago, back when the 55 monk wasn't as popular. Clearing the vale wasn't as worthwhile as clearing the ice wastes, but they still dropped (almost as often as aatxes did).
I have killed many as well, but have yet to see 1 ecto from them. Nevertheless, I have seen people claim that long before the last 4-5 (nerfs) for uw(in particular)(and on another forum) they used to drop them.
Yes, before the Prot Bond nerf, I would quite frequently get ectos from graspings. Haven't gotten any from them since, though.