You could try asking in one of the vidding communities like vidding or vidfinders. I imagine some people there might know this stuff having done the same thing you're doing. Maybe.

I think that Killa's vids (or at least some of those co-authored with others) may be found at Triptych Vids.

Media Cannibals website has email addresses where you can ask for info. Also a link to Clucking Belles vid site (Sandy 'n Rache). (Media Cannibals entry at Fanlore might also be useful.)

The Circuit Archive Vids page has links to Pros vids by some of the folks you mentioned.

Gwynethr vids on disc and online.