Hi,
Do you what Hspice to find the correct value for Rc and Cc then only way i can think of it is, using optimization. Look into the SA manual for usage. This is some wht automatic.
other way is to do data sweep different set of values for u r Rc and Cc. Here you have to check the results u r self.
Upto my understanding this Rc and Cc has to be decided by you based on U r design requirement and I don't think it will be gud to find the values by trails.
Hope this helps.
Thanks,