I vote for more "morning" auctions.
The high number of auctions in the late PM SLT has puzzled me for a while.
Take a look at this graph from
http://etitsup.com/slstats which shows the current online SL users in real time (Screenshot below, follow the link for real time)
The number of concurrent users online is at noon SLT, which equals 20.00 (8PM) GMT on the graph, while the regular auctions don't start until the number of users is in a steady decline.