Could you link the threads? I found Cataclysm there:
http://forum.shrapnelgames.com/showthread.php?t=42846 but can't find the others (at least not in the first five pages of the forum).
I could sub for one game but I can't connect during week-ends so I can't play 24h-turn-games. 48 is normally ok.
I'm not familiar with Utgard. I know LA Atlantis better so if the pace is ok I could sub for you in Red_Ruby. If i'ts faster, I can sub Utgard in Cataclysm but don't expect miracles.