To make sure I understand your situation and question...
You have created a mirror site to cloak. THEN when someone clicks a link on the mirror site (for exmaple, "Click Here to View Product X Detail"), they're taken to that page on the "REAL" site?
When you write "...redirects from optimized pages to the main site" ...
... "optimized" pages are "cloaked" pages?
The URL in the SE will display as whatevber the "clicked-on" links anchos says. If you click on a link on the cloaked./optimized page leading to "http://www.wodgets.com/blue/" THAT IS EXACTLY what will who up in the S.E. description.
OR... do you mean what URL will be shown for the site "visited" (The cloaked site)?
If that;s your question, then yes, the cloaked site;'s URL will be displayed as the site being ashown in the SERPs.
Simple solution I've used successfully many times: Use a VERY similar URL
e.g.: if the main site is www.WidgetsSite.com" try "WidgetsSite.net" for the cloaked site. Or... "www.TheWidgetsaSite.com" or a misspelling: "www.WigdetsSite.,com" I've never been called on it.
But I'm confused as to your problem. And I COULD BE WAY OFF BASE.
If you're using PHP to cloak, I'm CONFIDENT I can help you.