Using hooks for processing all results and facets - Apachesolr 1.0

Hello,

We're trying to filter the results provided by apachesolr in the hook apachesolr_process_results (not sure if this is the right place)
Here's what i'm trying for a franchise locator

Content Type: Franchisee (bunch of fields for title, type, services provided etc + location cck)
Number of nodes: 2000

Now we're building an Advanced Search form which combines the facets for Franchise Type and a proximity search using
Zipcode + Radius.
The form captures the user input
keywords, franchise_type, zipcode + radius.

The intent of the form submission is to provide all Franchise of a particular type and within a finite radius of a zipcode (for a keyword)

Upon form submit, we're redirecting them to the apachesolr search url which contains the filters for facet franchise_type with our params for
radius+zipcode.

so the url would look something like http://www.example1.com/search/apachesolr_search/pizza?filters=type%3A11...

The results are initially generated by the apachesolr query - http://www.example1.com/search/apachesolr_search/pizza?filters=type%3A11
We then have a custom module and in the hook apachesolr_process_results we are using the $results to filter the nodes based on the combination
of radius + zipcode.

The problem here is
- $results is only showing the current 10 nodes for the page (nodes/page=10)
- The facets don't get updated upon the manipulation of the $results.

Is there another hook/technique one can use to essentially filter the entire $results and also ensure the facets reflect the filtered $results.

Thanks.

Yashesh Bhatia