I'm with mrpeachy for the most part. You can't do that kind of operation in Conky. Where we depart is the fact that I go a little nuts when people don't use Code tags and curly braces. They're for your own good to use anyways.
As far as I know, how much physical memory you are using per process isn't available to you. However, mrpeachy is one of our lua Gurus around here, so if you ask him VERY nicely, he could probably coach you through the addition of lua to your script. Though, I'd like to see your entire script first, to see if that's a good idea for you or not. All I have is advice on this, unfortunately I don't have a definite solution.
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