First of all, when did you apply arctic silver? Most models of AS will take a few days to burn in until they perform to their maximum! Did you apply AS the way they wanted to? Which model of AS do you have? But it is really impossible to tell what is the "correct" temperature, as everyones processor, ambient temperature, and case is different. Or at least, in someway is different.
Sorry for late reply.
Let me answer some of the questions you asked
when did you apply arctic silver?
>>>One week before I posted this question on forum.
Most models of AS will take a few days to burn in until they perform to their maximum!
>>>This was the most important information I got here. I referred the AS site for this and they have exact same suggestion.
Did you apply AS the way they wanted to?
>>>I applied using square method but AS people suggested circle method.
I am going to run the tests again and will post the results here.