I think that for KOG, Seattle and IDUAD the best versions are to be selected among the ones with Ruth, even though her voice was soft. I personally love the versions from Clermont, but I'm biased ( I was there).
Similarly I think the best versions of IUTC, RAJ, GH and OSL have to be taken from shows with Nigel, although he was also underused I think he brought a lot to the songs. I personally love GH from Newcastle because of the synth intro rather than flute, that is reminiscent of Alchemy.
For DOTDS I think Stuttgart is better than La Halle (more elaborated end solo) and because of Ian's mistake I also want to keep Paraguay from Stuttgart...
Talking about Stuttgart I am really puzzled that you (dmg) don't rate the show at all... Have you listened to TR end solo ? At the very end you have licks that are not from this world... And Speedway was very powerful !
For YTC I prefer Lubjana to Sofia... Longer end solo !
For SOS I think Instanbul blow them all away - very fresh and energetic.
My opinions are not that definite on other songs, but may I advise you to wait for saint-julien stick before final conclusions - that show was really something !