Red ring does in fact drop from dark falz in ultimate. (By certain section ID's / Whitill has the highest chance, but others such as Redria and Viridia have a chance of finding one as well)
Gene "Flow" was removed, yet it will be obtainable in future events.
http://brownskiii.tripod.com/
http://www.pso-world.com/items.php
You can use both of these as drop charts. They are accurate for the most part, but many of the episode 4 items such as galatine, and asteron belt are not obtainable.
You should just use these more as guidelines, I'd say that they are generally at least 90% accurate. (especially for non-ultimate difficulties)
EDIT:
If you would like a chart that is 100% accurate for this server you can look here:
Viridia: http://phantasystaronline.net/forum/index....t=0&start=0
Skyly: http://phantasystaronline.net/forum/index.php?showtopic=1178
At the moment only these drop charts are complete, but these charts are entirely accurate for this server.