PHPRC define the path to configurations like php.ini
FastCgiServer is for an static starter and you can't define two FastCgiServer!
for your vhosts with a own start script you need no fastcgiserver paramter in you config. you can define one
fastcgiserver but you mustn't du that.
please read http://www.fastcgi.com/docs/faq.html#PHP
, there are a general howto for fastcgi with php
does you use ispconfig for manage your vhosts etc.?