My first observation is that CPSM does not do round-robin function. It tries always to select the best place for execution and that best place is not necessarily the next available AOR. My second observation is to ask why you are worried about these AORs not doing any work? If the routing accomplishes the goals and meets response time requirements, then why worry about where the execution proceeds within?
You do not say whether or not your TORs and AORs are in the same LPAR of in different ones. However, the 15-second observation leads me to think that it is an LPAR environment. I think this because when CPSM is monitoring across LPARs, various usage and statistical info flows every 15 seconds. Thus, one would expect a different routing decision to occur roughly every 15 seconds as that's when the data for the determination of the best place across the LPAR is updated.
However, this may not be the case as you also mention that things seem to route widely at low transaction rates but unevenly at moderate or high transaction rates. I do not believe the high rate situation as that would ensure what you think of as a proper distribution. So, I'm left with moderate transaction rates for your unease.
Again, I think I appeal to the "who cares" argument. As things are working to satisfy your requirements, so what? That's rather unhelpful but perhaps you have got your goal and queue WLM definitions imprecisely setup. You could try tinkering with them but I really don't recommend it. You seem to have a configuration with spare capacity and performance satisfies your users. I'd be very inclined to leave things alone.
I'd recommend that if you are still concerned about this, and I think you shouldn't, then your next step might be to look at the various Share/Guide presentations on CPSM. There was an especially good series of articles in recent issues of Xephon's CICS Update by Mr. CPSM himself.
CICS Technical Strategist -- CICS expert at Search390.com
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This was first published in July 2003