Don't forget that relevant keywords in the item description, especially at the beginning, are just as important as relevant keywords in the title, for instance for your 2000 AD comics only a few mention Judge Dredd in the title, & I haven't seen him mentioned in any of the descriptions, yet I'm sure they are the kind of keywords that many casual buyers would use.
As your store is split into categories why not change the first category to countdown, for a month, & leave the rest as RUS.
Then in a months time, change the 1st category back to RUS & change the next category to countdown, etc, etc. that way the content would appear fresh & you would increase visibility on the site,
Stagger the start & end times, & it might be an idea to let the items on countdown actually end, you could then repost with new auction numbers, which should prompt google to reindex them.