SSL, HTTP and HTTPS

Hi,

I want my WPMU site to be SSL-only. The first thing I did was (in wp-config.php)

define('FORCE_SSL_ADMIN', true);

Then I changed some strings in wp_options (home, siteurl, fileuplaod_url) from http://url to https://url. For this blog, everything works fine. But whenever I create a new blog, those values (home, siteurl, fileuplaod_url) start with http, not https. My question: what do I have to change so that WPMU creates new blogs with https?

Thanks,
Jo