Not sure what you're doing but if I understand what you're saying but this is how I'm using this:
1 (parent) request for the page: this contains the overall page layout.
1 sub request for the page: this contains the page content.
This means that when I do a forward the I am forwarding the sub request (not the parent).
I think what you and davidpv are looking for as a method to forward the parent request, that's not what this is for I'm afraid.