I tried conky switcher some days ago and already deinstalled it again as it's way too hungry for letting it run in background all the time (I had a cpu workload of 30% minimum!).
Nevertheless, I like your config file (the 'normal' cpu one) and consider using it with standard conky. Could you tell me wether the config files itself have some ressource hungry parts or is it just the switching and updating process thats consumes so much power?